Dr. Ronnie Levy, Extension Rice Specialist at LSU wrote this article for the April 2022 issue of Rice Farming Magazine. I clipped it out and thought, “this will come in handy someday!” I am putting this out there again because our organic rice producers are facing some real problems with weeds in rice including weedy rice, hemp sesbania, jointvetch and certainly weedy grasses.
Last year I was at Joe Broussard’s farm near Nome, looking at a rice field that was headed out and looking great. On the other side of the levy was a field choked with weeds – what was the difference? One was water-seeded rice, and the other was not. Joe had used water seeding and his flood to control weeds “the old-fashioned way!” So, read this article by Dr. Levy and think about it……
Rice Farming, April 2022. Dr. Ron Levy. “Most rice is drill-seeded in Louisiana — about 80% — but there is a renewed interest in water-seeding rice for weedy rice suppression (or many other weeds in organic systems).
The most common water-seeding method in Louisiana is the pinpoint flood system. After seeding, the field is drained briefly. The initial drain period is only long enough to allow the radicle to penetrate the soil (peg down) and anchor the seedling. A three- to five-day drain period is sufficient under normal conditions.
The field then is permanently flooded until rice nears maturity (an exception is midseason drainage to alleviate straighthead (physiological problem of rice) under certain conditions).
In this system, rice seedlings emerge through the floodwater. Seedlings must be above the water surface by at least the 3 to 4-leaf rice stage. Before this stage, seedlings normally have sufficient stored food and available oxygen to survive. Atmospheric oxygen and other gases are then necessary for the plant to grow and develop.
The pinpoint flood system is an excellent means of suppressing weedy rice emerging from seeds in the soil because oxygen necessary for weedy rice germination is not available as long as the field is maintained in a flooded (or saturated) condition. A continuous flood system, another water-seed system, is limited in Louisiana. Although similar to the pinpoint flood system, the field is never drained after seeding.
Regarding the water-seeded systems, a continuous flood system is normally best for red rice suppression, but rice stand establishment is most difficult. Even the most vigorous variety may have problems becoming established under this system. Inadequate stand establishment is a common problem in both systems.
Fertilization timing is the same for both the pinpoint and continuous flood systems. Phosphorus (P), potassium (K), sulfur (S) and zinc (Zn) fertilizers are applied preplant incorporated as in the dry-seeded system. Once the field is flooded, the soil should not be allowed to dry.
If the nitrogen requirement of a particular field is known, all nitrogen fertilizer can be incorporated prior to flooding and seeding or applied during the brief drain period in a pinpoint flood system. Additional N fertilizer can be applied at the beginning of reproductive growth between panicle initiation and panicle differentiation (2-millimeter panicle).
Water-seeding has been used in the past for weed control. Will water-seeding make a comeback to help with weedy rice suppression (or possibly for organic rice producers)?”
Another issue water-seeded rice may experience.
Rice Seed Midges – The larvae of these insects (Order Diptera, Family Chironomidae, Genera Tanytarsus and Chironomus) are aquatic and can be very abundant in rice fields. The adults are small, gnat-like flies that typically form inverted pyramidal mating swarms in the spring over stagnant or slow-moving water. Female flies lay eggs in ribbons on the water surface. The larvae hatch and move downward to the flooded substrate where they build protective “tubes” of silk, detritus, and mud. These brown, wavy “tubes” are easily observed on the mud surface of rice paddies. Occasionally, the larvae will exit the tubes and swim to the surface in a whiplike fashion, similar to that of mosquito larvae. Midge larvae can damage water-seeded (pinpoint or continuous flood) rice by feeding on the sprouts of submerged germinating rice seeds. Damage can retard seedling growth or kill seedlings; however, the window of vulnerability to midge attack is rather narrow (from seeding to when seedlings are about 3 inches long).
Control rice seed midge problems by dry seeding, then employing a delayed flood, or by draining water-seeded paddies soon after planting. Thus, a pinpoint flood should reduce the potential for rice seed midge damage relative to a continuous flood. For water-seeded rice, reduce rice seed midge problems by increasing the seeding rate and planting sprouted seed immediately after flooding.
Click on the above link to read a great article from California rice researchers about an experiment they did on Rice Seed Midge control and some of the most effective treatments are organic and soon to be OMRI approved.
Last year USDA put out the call for grant applications for the Organic Market Development Grant program. This was a chance to apply for up to $3 Million in grant funds with a match or up to $100,000 for equipment with no match. The Organic Market Development Grant (OMDG) program supports the development of new and expanded organic markets to help increase the consumption of domestic organic agricultural commodities. The program focuses on building and expanding capacity for certified organic production, aggregation, processing, manufacturing, storing, transporting, wholesaling, distribution, and development of consumer markets. OMDG aims to increase the availability and demand for domestically produced organic agricultural products and address the critical need for additional market paths.
Texas organic producers have excelled in their efforts, submitting a multitude of grant applications, and the results are now in. Below, discover the exceptional organic projects that have been chosen to enhance organic agriculture in Texas for the foreseeable future.
Promotion of Organic Yaupon Tea as a Domestic Alternative to Imported Tea Distributed to The Foodservice Industry
Recipient: Yaupon Holly Tea, LLC, Cat Spring, TX
This project aims to increase the American consumer awareness of organic yaupon tea as a replacement for imported tea via the food service sector. An Organic Yaupon Marketing Plan will increase opportunities for consumer exposure to organic yaupon tea while also allowing for additional customers, buyers, and parties to participate in the domestic organic yaupon tea industry. Yaupon is a caffeinated plant native to North America and rich in polyphenols and antioxidants like imported tea. By using a hybrid of traditional tea preparation methods, organic yaupon tea has an almost indistinguishable flavor profile from imported green and black tea served in both hot and iced tea. Cat Spring Yaupon has created a cohesive marketing and outreach plan to increase the amount of organic yaupon tea served in restaurants, cafes, hotels, and spas. This plan incorporates the opportunity to promote and support additional organic yaupon producers through the American Yaupon Association while also supplying to tea companies who would otherwise be selling imported tea to their food service customers. This will also allow restaurants to substitute imported tea on their menus with organic yaupon tea thus giving their customers and guests an opportunity to sample and fall in love with the incredible domestic organic yaupon tea.
Diversifying Organic Supply Chains for Small Producers in the Rio Grande Valley
Recipient: Triple J Organics, LLC, Mission, TX
Triple J Organics is a minority-owned certified organic citrus orchard in Mission, Texas established in 1995. Triple J manages 25 acres of certified organic citrus groves, primarily of Ruby Red grapefruit and early season oranges, as well as Navel Oranges, Meyer Lemons, Tangerines, and Tangelos in smaller quantities. This project will increase consumption of locally produced organic orange juice in the Rio Grande Valley and increase the profitability and long-term viability of Triple J Organics through special purpose equipment purchases that allow Triple J to process 32,000 lbs. of “waste”, or seconds, oranges into fresh juice and deliver it safely to customers in the Valley. The project will target school districts as potential customers, as well as supermarkets, restaurants, health food stores, daycare facilities, and eldercare facilities as needed. Beneficiaries include Triple J Organics, local schools and businesses who purchase the new product, as well as other organic citrus growers in the Valley who may be able to cooperate and aggregate to produce a higher margin value-added product.
Steelbow Farm: Expanding Access to Local, Organic Produce in Central Texas
Recipient: Steelbow Farm LLC, Austin, TX
Steelbow Farm is seeking to broaden its delivery range and increase local food access and supply chain resilience by procuring a delivery vehicle. The overarching purpose of the proposed project is to expand access to local, organic produce by eliminating the current constraint of distance and delivery radius, while simultaneously addressing the growing demand for product in the current marketplace. Currently, Steelbow Farm has demand for their product that exceeds their capacity because they do not have a vehicle and therefore have a limited delivery range. This bottleneck is hampering Steelbow Farm’s ability to rise to the organic market demands. They believe access to this equipment would drastically improve access to organic produce, as they could radically increase their customer base and range. For context, currently, within Travis County, only .06% of food is produced locally. The Austin and Travis County areas are seeing a decline in the amount of vegetable farms and farmland, which are disappearing at an alarming 16.8 acres a day. Amidst these startling statistics, this business is thriving and demand for their produce is extremely high. Steelbow Farm wants to be able to meet the market demand and fill the gap within the local food system. As organic vegetable producers, they are striving to increase the percentage of local food consumed within their community.
Enhancing Organic Dairy Production and Market Access in Texas
Recipient: Armagh Fine Foods LLC dba Armagh Creamery, Dublin TX
The primary goal of this project is to enhance and expand the production capabilities of the Armagh Creamery organic farming and dairy operations. By acquiring essential equipment, the project aims to achieve increased efficiency, product diversification, and expanded distribution. This equipment will enable us to venture into new product lines, including heavy cream and butter, expand production of existing products, and streamline the production process, reducing the workload on current employees and enhancing overall efficiency for creating new butter product lines. The acquisition of a delivery vehicle will significantly improve distribution capabilities, allowing us to reach local retailers and drop locations in Central, North, and West Texas. This expansion will promote the availability of organic dairy products to a wider consumer base. The specific objectives of this project are two-fold: 1) to scale yogurt production to the full daily capacity of 10,000 units per day, two days a week. This increase will enable us to supply more retailers throughout Texas and cater to the growing demand in the direct-to-consumer market and 2) to expand raw milk and cream production to 600 gallons a day for 3-4 days a week, resulting in a weekly output of 1800 to 2400 gallons. This expansion will further support the direct-to-consumer market and provide ample resources for the planned heavy cream and butter product lines.
Expanding Capacity and Improved Quality of Organic Cotton
RKH Gin LLC, dba Woolam Gin is a primarily woman owned ginning facility that has processed organic cotton for 33 years, being the first United States to do so. It is located in a high poverty area in Lynn County, Texas and serves other high poverty areas including Dawson and Terry Counties. Woolam Gin is seeking a grant award to purchase and install equipment to expand the services and improve processing to increase production of organic cotton for farmers which will improve overall market production of the beneficial product. The overarching project purpose is to improve efficiency, therefore improving outcomes for farmers and the organic market. The equipment will increase production from 25 bales an hour to up to 40 bales an hour. The increase in processing will improve the housing time of cotton in the warehouse which will improve the grades and facilitate earlier entry into the marketplace, benefiting farm producers, processors, and consumers. Faster processing will improve turnaround for the farmer and further increase production possibilities. The primary partners and collaborators of the project will include participating organic farmers, the project manager, project supervisor, gin manager and other supporting human resources workers. This grant award will create improved markets and expand processing capacity which in turn will enrich market availability and further development of production resources and production.
Texas Organic Market Development & Promotion
Recipient: Texas Department of Agriculture, Austin, TX
The Texas Department of Agriculture (TDA) will use a multi-faceted approach to promote local organic producers in the produce, grains, dairy, and fiber markets. Though these industries are each unique in their production, the issues they experience are similar. These challenges include, but are not limited to, lack of knowledge among consumers of each industry’s availability/benefits, existing gaps between producers and buyers that result in barriers for growth, and an absence of public resources that assist organic farmers from promoting themselves more efficiently. Through this project, TDA will increase local consumer knowledge, support activities to develop new markets, increase demand for domestically produced organic agricultural products, and provide additional market paths for organic farmers in Texas. Goals of this project include: 1) increase public knowledge of Texas organic agriculture industry, 2) provide opportunities to improve market share and sales of local organic producers, and 3) build new connections between Texas producers and potential buyers to accomplish these goals. TDA Marketing will produce new marketing materials targeted for the organic industry, assist organic producers with attending trade shows relevant to their respective industries, facilitate business to business interactions, and run a social media campaign that highlights each industry. These activities will strengthen the relationships between Texas organic crop/product producers and buyers, as well as better inform the public on the availability and benefits of Texas organic products. These relationships would aid in ongoing efforts to strengthen the supply chain issues, build on current opportunities with Texas agriculture associations, assist historically underserved communities, and increase demand for locally produced organic products. To further assist the organic industries of Texas, TDA will assist in the production of the Field View Organics program. This program aims to identify organic operations across the state and mark them for aerial spraying companies to help prevent potential chemical drift or contamination of organic crops. By supporting this initiative, TDA will protect the current organic producers across the state and alleviate potential concerns for new members wanting to enter the industry.
Here is the entire list of projects funded by USDA for the entire country. This list should give you some ideas for submitting an application for the next grant program that come along! Organic Grant Winners
(This article first appeared in “Texas Dairy Matters” and has since been published in Texas Ag and Dairy Review. I have had an opportunity to work with some of these technologies and these researchers on an organic dairy investigating the potential to improve both mastitis control and long-term animal health. Bob Whitney)
Non-Antibiotic Management of Mastitis in Dairy Cattle
1 Graduate Research Assistant 2 Assistant Professor. Department of Animal Sciences, Texas A&M AgriLife Extension Service, The Texas A&M University System
Mastitis is a common and costly disease affecting dairy cattle worldwide. It is characterized by inflammation of the mammary gland, typically caused by bacterial infection. Mastitis is typically managed on dairy herds with intramammary antibiotics. However, not all mastitis events respond to treatment with antibiotics, depending on the pathogen associated with the disease event and cow level factors. In addition, prudent and appropriate use of antibiotics is an essential step in achieving antimicrobial stewardship in dairy farms. In some management systems such as organic systems, the use of antibiotics is restricted (USDA, 2017). This presents the need to explore options to manage mastitis without the use of antibiotics.
In this article, we discuss. some strategies currently being evaluated by our group to manage mastitis events.
A) Acoustic pulse technology:
Acoustic pulse technology, APT, has emerged as a promising non-antibiotic therapy for managing mastitis in dairy cattle. Specifically adapted for treating mastitis, APT uses repeated projectile collisions with an anvil connected to the treatment head. These collisions generate low-incidence shockwaves or acoustic pulses that are transferred non-invasively to the affected mammary gland tissues. Similarly to ultrasound therapy, ATP uses sound waves to deliver energy. However, APT delivers lower-frequency sound waves that can penetrate deeper into tissues compared to ultrasound therapy. The therapeutic effects of APT include promoting recovery, reducing inflammation, and potentially improving blood flow and immune responses (Leitner et al., 2021). Recent studies have shown positive outcomes, such as increased recovery rates, reduced culling and additional milk yield in APT-treated cows compared to controls (Blum et al., 2023). This innovative approach offers an alternative to antibiotics, contributing to udder health and overall dairy cow welfare.
B) Cold laser therapy:
Cold laser therapy, also known as low-level laser therapy, has been explored as a potential non-antibiotic treatment for mastitis in dairy cattle. Cold laser therapy is currently used by many veterinarians as an alternative therapy approach to manage inflammation in small and large animals, including horses. This technology works on the principle of “photobiomodulation,” which refers to a therapeutic technique that uses light energy to stimulate cellular processes. In the context of dairy cattle, photobiomodulation has gained attention for its potential benefits in various aspects of herd health and productivity. There are reports of this technology used to promote wound healing and tissue repair. Photobiomodulation can accelerate wound healing and tissue repair by promoting cellular metabolism and enhancing blood flow. The technology can also help with pain management as the anti-inflammatory effects of photobiomodulation can help alleviate pain and discomfort. It has particularly been useful for managing conditions like lameness or joint inflammation (Gard et al., 2017).
Photobiomodulation has been explored as an adjunctive therapy for mastitis treatment. By reducing inflammation and promoting immune responses, it may aid in faster recovery. Light-emitting diodes, LEDs, or lasers are used to deliver specific wavelengths of light to targeted areas for a specific duration. Treatment protocols vary, but sessions are typically short and non-invasive. Although research is ongoing by our group, the results have indicated potential benefits. In à separate study, the laser irradiation resulted in a 16.6% increase in recovery, indicated by regression of signs of inflammation and a decrease in the somatic cell counts. Supportive treatment with laser irradiation increased recovery rates by 24.2% (Malinowski, et al., 2019). However, further studies are needed to establish its efficacy by evaluating optimal duration and wavelength combination for mastitis and somatic cell count management.
C) Plant molecule-based compounds:
One of the new tools for mastitis management that is getting attention is called antibiofilm compounds derived from plant molecule-based a non-antibiotic therapy for compounds. Mastitis-causing bacteria form and maintain biofilm through the process of quorum sensing. Bacteria produce biofilms as a survival strategy, especially in challenging environments. Biofilm protects the bacteria as a shield preventing immune cells from directly reaching the bacteria. The plant-based molecules use quorum sensing science to disrupt communication between selected mastitis-causing bacteria (Herrema et al., 2023). The components can block bacterial communication and influence their behavior such as biofilm formation. This process is called quorum quenching or quorum sensing inhibiting. In bacteria, the formation of biofilms is controlled by quorum sensing, QS, signaling genes and their products. Various inhibitors/compounds can disturb the QS signaling cascade and are used as an alternative therapy to optimize biofilm-related challenges. Reducing bacterial QS signaling by proprietarily selected plant molecules is possible because they possess inhibitory activity against bacterial and fungal biofilms. There are claims this technology promotes overall herd health and longevity of cows.
(The plant molecule-based compounds currently being evaluated are produced by AHV International. Some organic dairy producers are reporting varied success with these treatments, but more work is being done to evaluate their use. Bob Whitney)
References:
Blum, S.E., Krifuks, O., Weisblith, L., Fleker, M., Lavon, Y., Zuckerman, A., Hefer, Y., Goldhor, O., Gilad, D., Schcolnic, T. and Leitner, G., 2023. Evaluation of acoustic pulse technology as a non-antibiotic therapy for intramammary infections: Assessing bacterial cure biofilm vs. recovery from inflammation. Frontiers in Veterinary Science, 10, p.1079269.
Gard, J. 2017. Laser Therapy in Food-Animal Practice. Laser Therapy in Veterinary Medicine: Photobiomodulation, 423-430.
Herrema, F., Bieleman, H., Hoekstra, M. and Gomes, J., 2023. Longevity and Milk Production Improvement in Dairy Cows Using Plant-Derived Products. J Vet Heal Sci, 4: 128-140.
Leitner, G., Papirov, E., Gilad, D., Haran, D., Arkin, O., Zuckerman, A. and Lavon, Y., 2021. New treatment option for clinical and subclinical mastitis in dairy cows using Acoustic Pulse Technology (APT). Dairy, 2: 256-269.
Malinowski, E., Krumrych, W. and Markiewicz, H., 2019. The effect of low intensity laser irradiation of inflamed udders on the efficacy of antibiotic treatment of clinical mastitis in dairy cows. Veterinaria italiana, 55: 253-260.
USDA, AMS 2017. National Organic Program (NOP); Organic Livestock. and Poultry Practices. A rule by the Agricultural Marketing Service. The Federal Register.
Soil sampling is an essential practice in agriculture, providing a foundation for informed decision-making regarding soil management and crop production. The process involves collecting soil samples from multiple locations within a field to analyze for nutrient content, pH levels, organic matter, and other soil properties. This analysis offers a snapshot of the soil’s health and fertility, guiding farmers and agronomists in customizing fertilizer applications and other soil amendments to meet the specific needs of their crops. By tailoring these practices based on soil test results, producers can optimize plant growth, increase crop yields, and reduce the risk of over-application of fertilizers, thereby minimizing environmental impact.
The benefits of soil sampling extend beyond the immediate improvement of crop production. It plays a crucial role in sustainable agriculture by helping to maintain soil health over the long term. Healthy soil supports a diverse microbial ecosystem, improves water retention and drainage, and enhances the soil’s ability to store carbon, contributing to the mitigation of climate change. Moreover, by understanding the soil’s condition, farmers can adopt practices that prevent soil degradation, such as erosion and nutrient depletion, ensuring the land remains productive for future generations. Thus, regular soil sampling is a key tool in the pursuit of sustainable farming, enabling the efficient use of resources while protecting and enhancing the natural environment.
Taking a proper soil test involves a series of steps to ensure the accuracy of the soil sample, which in turn, provides reliable data for making informed agricultural decisions. Here is a detailed list of how to conduct a proper soil test:
Planning the Sampling Strategy: Determine the appropriate time and pattern for sampling. Ideally, soil should be sampled at the same time each year, avoiding periods immediately after fertilizer application. Divide the field into uniform areas based on soil type, topography, previous crop history, and apparent soil variability.
Gathering the Right Tools: Equip yourself with a clean, rust-free soil probe, auger, and/or shovel, and a plastic bucket. Avoid using metal containers which can contaminate the soil sample with trace metals.
Sampling Depth: Collect soil samples at a consistent depth. For annual crops, a depth of 6-8 inches is typical, whereas for perennials, samples may be taken from a deeper profile, depending on the root zone of the crop.
Collecting the Soil Sample: In each area, collect soil from at least 15-20 random spots to avoid bias. Mix these sub-samples in the plastic bucket to form a composite sample. This approach ensures the sample represents the overall area rather than specific spots.
Labeling and Documentation: Clearly label each sample with a unique identifier, noting the sampling date, location, depth, and any other relevant information. This step is crucial for keeping records and interpreting the results accurately.
Preparing the Sample for Analysis: Allow the soil to air-dry at room temperature; avoid heating or sun-drying as this can alter the soil chemistry. Once dry, remove stones, roots, and other debris, and break up clumps. A quart-sized sample is typically sufficient for laboratory analysis.
Choosing a Laboratory: Select a reputable soil testing laboratory that uses methods appropriate for your region’s soils. Provide the laboratory with detailed information about your crop, previous fertilizer applications, and any specific concerns you have.
Interpreting the Results: Once you receive the soil test report, review the recommendations on fertilization and soil amendment. If necessary, consult with an agronomist or extension specialist to understand the implications for your specific situation and crops.
Implementing Recommendations: Use the soil test results to adjust your fertilization strategy, applying nutrients according to the crop’s needs and the soil’s current status. This targeted approach helps avoid overuse of fertilizers, promoting environmental sustainability and economic efficiency.
Monitoring and Adjusting: Soil testing should be a regular part of your farm management practice. Re-test soils in each field every 2-3 years or more frequently if significant amendments have been made, to monitor changes in soil health and fertility over time.
Above is a standard soil probe that will last you for years – well worth the cost. Next is a picture of WD-40 which is a great spray for the probe to keep the soil from sticking in the probe. Clay soils can be difficult to get “out” but WD-40 eliminates the issue.
Following these steps ensures that the soil testing process is thorough, and the results are reliable, forming a solid basis for sustainable soil management and crop production strategies.
What does a soil test tell you about soil?
Soil testing encompasses a range of analyses that evaluate different aspects of soil health, soil properties, and soil fertility, providing critical information for agricultural management and environmental assessment. Here are several key types of soil tests commonly conducted:
pH Test: Measures the acidity or alkalinity of the soil on a scale from 1 to 14. Soil pH affects nutrient availability to plants and microbial activity in the soil. A pH of 7 is neutral, values below 7 are acidic, and values above 7 are alkaline.
Nutrient Content Test: Assesses the levels of essential nutrients, including nitrogen (N), phosphorus (P), potassium (K) (often referred to as NPK), calcium (Ca), magnesium (Mg), sulfur (S), and micronutrients like iron (Fe), manganese (Mn), copper (Cu), zinc (Zn), boron (B), molybdenum (Mo), and chlorine (Cl). This test helps in determining fertilizer needs.
Organic Matter Test: Evaluates the amount of organic matter in the soil, which influences water retention, nutrient availability, and soil structure. High organic matter content is beneficial for soil health and plant growth.
Soil Texture Test: Determines the proportions of sand, silt, and clay in the soil. Texture affects water retention, drainage, and nutrient availability, and it guides management practices such as irrigation and cultivation.
Cation Exchange Capacity (CEC) Test: Measures the soil’s ability to hold and exchange cations (positively charged ions) such as calcium, magnesium, and potassium. CEC is influenced by soil texture and organic matter content and affects soil fertility.
Electrical Conductivity (EC) Test: Assesses the soil’s electrical conductivity, which is an indicator of salinity levels. High salinity can affect plant growth by inhibiting water uptake.
Lime Requirement Test (Buffer pH Test): Determines the amount of lime needed to adjust the soil pH to a desirable level for crop production. This is crucial for acidic soils needing pH correction.
Soil Water Holding Capacity: Measures the amount of water the soil can hold and make available to plants. This is important for irrigation planning and drought management.
Soil Aggregate Stability: measure how well aggregates hold together during a disturbance event. These tests can predict soil risks or management needs and track changes to soil overtime. The SLAKES APP is a great tool that is easy to use on your smartphone.
Heavy Metal Test: Identifies the presence and concentration of heavy metals such as lead (Pb), arsenic (As), cadmium (Cd), and mercury (Hg), which can be toxic to plants and humans at high levels.
Soil Health Tests: These are comprehensive tests that may include biological indicators such as microbial biomass, enzyme activities, and earthworm counts, assessing the overall health and biodiversity of the soil.
Soil Tests Typically Taken
Of course, a normal soil test or what you might call a Regular Soil Test discussed above is a must. These are not usually expensive, +/- $15 or more with micronutrients. This test is mostly meaningless unless I have previous year’s results to see what is going on. I have taken literally thousands of soil samples and often I will see something show up that is off the charts. I am not known to panic when I see a problem because I am not going to react to that test unless I know it has steadily been a problem that is just getting worse. For instance, we can see pH swings in sand from one year to the next. Before I lime a soil, I may take a second sample just to verify I need lime. $15 soil test is cheaper than $60 per acre lime application.
Second, I like to have a Haney Soil Testdone to get an idea of the availability of many nutrients in an organic system and to better understand the overall “healthiness” of the soil. It is not cheap compared to the typical soil test. Most labs charge $50 so you don’t usually just send everything in for a Haney Test. Again, the results are only good if you have several years’ worth of data to see if you are getting better.
Next, is the Soil Wet Aggregate Stability Test. This test used to assess the ability of soil aggregates to resist disintegration when exposed to water.
Last, is the PLFA Test or Phospholipid Fatty Acid Test. This test measures the biomass of the microbes in the soil and is one of the tests that is currently being conducted to determine the microbial population of soil. See down below for more.
This is an example of soil test costs from one lab. They are all about the same price from multiple labs.
Haney Soil Health Test
The Haney Soil Health Test is a comprehensive analysis designed to evaluate the overall health and fertility of the soil through a holistic approach. Developed by Dr. Rick Haney, a research soil scientist with the USDA, this test goes beyond conventional chemical nutrient analysis by incorporating measurements of soil organic matter, microbial activity, and the potential for nitrogen and phosphorus mineralization. The test employs a unique set of assays, including the Solvita CO2-Burst test, which measures the amount of carbon dioxide released from the soil after rewetting dry soil to assess microbial respiration and activity. This is an indicator of the soil’s biological health and its ability to cycle nutrients.
Additionally, the Haney Test evaluates the water extractable organic carbon (WEOC) and water extractable organic nitrogen (WEON), which are believed to more accurately reflect the pool of nutrients that are readily available to plants than traditional extraction methods. By assessing both the chemical and biological fertility of the soil, the Haney Test provides a more integrated view of soil health, guiding farmers in optimizing their management practices to support sustainable agriculture. The results from the Haney Test can help in making more informed decisions on the application of fertilizers and amendments, aiming to enhance soil health, reduce environmental impact, and improve crop yields by fostering a more vibrant and resilient soil ecosystem. This test is particularly valuable for those engaged in regenerative agriculture and organic farming, as it aligns with the principles of nurturing soil life and function to achieve productive and sustainable farming systems.
The Haney Soil Health Test provides a comprehensive set of results that offer insights into both the chemical and biological aspects of soil health. The test results typically include several key indicators:
Soil Health Score: A composite index that reflects the overall health of the soil, integrating various test components to give a summary assessment. This score helps in comparing the health of different soils or the same soil over time.
Water Extractable Organic Carbon (WEOC): Measures the amount of organic carbon that is easily available in soil water, indicating the potential food source for microbes.
Water Extractable Organic Nitrogen (WEON): Indicates the level of organic nitrogen available in soil water, which can be readily used by plants and soil organisms.
CO2-C Burst (Carbon Mineralization): Assesses microbial respiration by measuring the burst of carbon dioxide released from the soil after it is moistened, indicating active microbial biomass and soil organic matter decomposition rate. This number will be between a low of <10 and a very high score is >200. This will be in parts per million or mg/kg which is the same.
Soil pH: The acidity or alkalinity of the soil, which affects nutrient availability and microbial activity.
Electrical Conductivity (EC): A measure of the soil’s electrical conductivity, which can indicate salinity levels that might affect plant growth.
Extractable Phosphorus, Potassium, Magnesium, Calcium, and other nutrients: Provides information on the levels of these essential nutrients that are available for plant uptake, based on water extractable methods.
Nitrate-Nitrogen and Ammonium-Nitrogen: Measures the inorganic forms of nitrogen available in the soil, which are directly usable by plants.
Cation Exchange Capacity (CEC): Indicates the soil’s ability to hold and exchange cations (positively charged ions) important for plant nutrition.
Organic Matter %: The percentage of soil composed of decomposed plant and animal residues, indicating the potential of soil to retain moisture and nutrients.
Recommendations for Fertilizer and Lime Applications: Based on the test results, specific recommendations are made to address nutrient deficiencies or pH imbalances, tailored to the crop being grown and the goals of the farmer.
These results (see below for a sample) offer a detailed picture of the soil’s current condition, highlighting areas where improvements can be made to enhance soil health, fertility, and productivity. By focusing on both the biological and chemical facets of soil health, the Haney Test guides farmers towards more sustainable and efficient management practices, emphasizing the importance of soil life in agricultural ecosystems.
Soil Wet Aggregate Stability Test
Soil wet aggregate stability testing is a method used to assess the ability of soil aggregates to resist disintegration when exposed to water. This test is crucial for understanding soil structure, which plays a vital role in the soil’s ability to support plant growth. In this method, soil aggregates are placed on a sieve and submerged in water, where they are subjected to gentle agitation to simulate natural conditions such as rainfall. The stability of these aggregates is then measured by determining how much of the soil remains intact after exposure to water. The results provide valuable insights into the soil’s resistance to erosion, its ability to retain water, and its overall structural integrity.
The importance of wet aggregate stability testing lies in its direct relationship to soil health and crop productivity. Stable aggregates improve water infiltration and retention, reducing the risk of surface runoff and erosion, which can lead to nutrient loss and reduced soil fertility. Additionally, well-structured soils with high aggregate stability allow roots to penetrate more easily, access nutrients, and withstand environmental stresses such as drought. For growers, maintaining high aggregate stability is essential for sustaining healthy crops and promoting long-term soil fertility, making this test a critical component of comprehensive soil health assessments.
The four methods you can use for measuring soil aggregate stability include: Slaking image analysis, Cornell Rainfall Simulator, Wet Sieve Procedure, Mean Weight Diameter
Slaking Image Analysis:
Overview: This method uses a smartphone app, like SLAKES, to capture and analyze images of soil aggregates submerged in water. The app tracks the degree to which the aggregates break apart (slake) over time. (easy to download to your smartphone and I can even use it!)
Why It’s Used: It offers a quick, accessible way to assess aggregate stability in the field without the need for specialized lab equipment. For farmers, this method is very easy and practical to use, making it ideal for routine soil health monitoring, though it may lack the precision needed for scientific research.
Overview: Soil aggregates are placed under a simulated rainfall, and the test measures how well the soil resists breaking apart and eroding. The simulator mimics natural rainfall to assess the soil’s response.
Why It’s Used: This method is particularly useful for understanding soil erosion potential and how soil structure withstands actual rainfall events. For farmers, it provides insights into how well their soil can handle heavy rains, though it typically requires access to specialized equipment only available at a few labs.
Wet Sieve Procedure:
Overview: In this method, soil aggregates are placed on a series of sieves and submerged in water. The sieves are then mechanically agitated to simulate natural conditions like water flow. The amount of soil that remains on the sieves is measured to determine stability.
Why It’s Used: It is a widely recognized and precise laboratory method for quantifying the stability of soil aggregates under wet conditions. Farmers might find this method less accessible due to its complexity, but it provides highly reliable data that can inform long-term soil management decisions. Typically used by researchers.
Mean Weight Diameter (MWD):
Overview: This method calculates the average size of soil aggregates that remain stable after being subjected to wet sieving. It provides a single value that reflects the overall stability of the soil.
Why It’s Used: MWD is a commonly used metric in soil science because it offers a straightforward way to compare the stability of different soils and management practices. For farmers, this method can be useful for tracking the impact of different practices on soil structure over time, though it’s usually conducted in a lab setting.
Using the PLFA Soil Health Test
The Phospholipid Fatty Acid (PLFA) analysis is a powerful tool for assessing soil health, focusing on the microbial community within the soil. Phospholipid fatty acids are components of cell membranes in all living organisms, and their presence and composition in soil samples can provide detailed information about the microbial community structure, including bacteria, fungi, actinomycetes, and other soil organisms.
How the PLFA Test Works
The PLFA test involves extracting phospholipids from a soil sample and then analyzing the fatty acid components. Each group of microorganisms has a unique fatty acid profile, allowing scientists to identify and quantify the types of microbes present in the soil. This information can be used to assess biodiversity, microbial biomass, and the balance of fungal to bacterial communities, which are critical indicators of soil health and ecosystem function.
Importance of PLFA Analysis for Soil Health
Microbial Biomass: The total amount of microbial biomass is a direct indicator of soil organic matter decomposition and nutrient cycling capabilities. High microbial biomass often correlates with healthy, fertile soil.
Community Composition: The composition of the microbial community can indicate the soil’s condition and its ability to support plant growth. For example, a higher fungal to bacterial ratio is often found in soils with good structure and organic matter content.
Soil Stress and Disturbance: Changes in microbial community composition can also indicate soil stress, contamination, or the impact of agricultural practices such as tillage, crop rotation, and the use of fertilizers or pesticides.
Baseline and Monitoring: Establishing a baseline microbial community profile allows for the monitoring of changes over time, assessing the impact of management practices on soil health.
Applications of PLFA Analysis
Agricultural Management: Helping farmers and agronomists understand the impact of farming practices on soil microbial communities and, by extension, soil health and crop productivity.
Environmental Assessment: Evaluating the restoration of soil ecosystems following contamination or disturbance.
Research: Advancing our understanding of soil microbial ecology and its relationship to plant health, climate change, and ecosystem services.
Advantages and Limitations
The PLFA test offers a direct, rapid assessment of living microbial biomass and community structure, providing valuable insights into soil health that are not captured by chemical soil tests alone. However, it requires specialized equipment and expertise to perform and interpret, and the cost may be higher than traditional soil tests. Despite these limitations, the PLFA analysis remains a critical tool for comprehensive soil health assessment, guiding sustainable soil management and conservation efforts.
Great publication you can read on understanding these Soil Health Tests. Just click the link below:
The “take home” message is not soil testing only, but records of soil tests you can see over time!
Trace Genomics Testing
Thanks to Dr. Justin Tuggle for sending this information to me about Trace Genomics. This is a fairly new company that basically tells you what kinds of microbes you have in the soil, good or bad, to then help make decisions of what you need to do. It may be a new variety, a biostimulant or a soil treatment. I would like to see some producers try this new test and share some examples of what it can do. Click here to see their webpage.
A quote from Trace Genomics
“We engage in hi-definition DNA sequencing down to the functional gene level. This lets us mine the soil microbiome to identify specific functions, commonly referred to as “indicators,” which can provide actionable insights to help you maximize soil health. One example is a phosphorus solubilization indicator, which analyzes the quantified capability of microbes in the soil to release bound phosphate and make it plant available.”
“In just one soil test you get insights covering more than 70 crops and more than 225+ pathogens. TraceCOMPLETE pairs unmatched soil analysis with hi-definition genomic sequencing to deliver an unrivaled collection of pathogen and nutrient insights. It can drive agronomic action in your most critical decision areas to help you make meaningful management decisions.“
Soil Labs: this is not a complete list by any means but simply a guide.
Cover crops play a pivotal role in sustainable agriculture by enhancing soil health, managing pests and diseases, and improving overall crop yield resilience. Cover crops can be any non-harvested crop used primarily to protect soil from erosion during off-season periods, provide actively growing roots to extract and stabilize nutrients that might be otherwise vulnerable to leaching or volatile loss, and increase levels of SOM to promote soil physical properties and C sequestration. Cover crops have other values to farmers, as some crops can also be harvested for forage or seed or to diversify the cropping system to suppress diseases, obtain other crop rotation benefits, improve off-season access to fields, or extract water during wet periods.
As a source of additional C delivered to soil during non-cash-crop growing periods (e.g., in fall and winter in many temperate regions), cover crops are particularly effective in supplying soil microorganisms with readily available carbon sources from both root exudates during growth and C-rich crop residues upon termination. Several studies have found greater soil organic carbon sequestration with implementation of cover crops (Poeplau and Don, 2015). Often combined with no-tillage, management of cropland with cover cropping can enhance soil organic C sequestration due to addition of organic materials growing directly on land rather than imported from another location.
In the summer we plant sorghum sudangrass (top picture) for weed control because it has an allelopathic effect on weeds (click that link to read about it) and it shades any weeds coming on later. It is a vigorous and versatile cover crop that stands out for its exceptional contribution to soil health and weed suppression. Its rapid growth and dense canopy make it highly effective at outcompeting weeds, thus reducing the reliance on herbicides. This competitive growth habit is instrumental in shading out weeds, significantly lowering weed biomass and seed bank potential in the soil. Beyond weed control, sorghum sudangrass excels in improving soil structure and health. Its deep and extensive root system breaks up compacted soil layers, enhancing soil porosity and aeration. This root action not only facilitates better water infiltration and storage but also promotes the activity of beneficial soil organisms by increasing organic matter and available nutrients in the soil profile. Just remember the allelopathic effect (preventing weeds or the crop growing) last for 10-14 days after soil incorporation!
The benefits of sudangrass extend to its role in adding organic matter to the soil when it is mowed and incorporated as green manure. This process means making sure the plant is in a 30-40:1 Carbon to Nitrogen ratio. The decomposition of sudangrass residue releases significant amounts of nutrients, especially nitrogen, which are then available for subsequent crops, thereby improving soil fertility. Additionally, sudangrass has been noted for its biofumigant properties, particularly when specific varieties are used. The breakdown of its tissues can release compounds that suppress soil-borne pathogens and nematodes, further promoting a healthy soil environment conducive to high-yielding crops. However, it’s important to manage sudangrass properly, as allowing it to reach maturity (beyond the 40:1 carbon to nitrogen ratio) can result in a tough, woody residue that is slower to decompose and might interfere with planting subsequent crops.
Sunn Hemp
Sunn hemp (picture above) is increasingly recognized for its substantial benefits as a cover crop, particularly in warm climates where it thrives. One of the key advantages of incorporating sunn hemp into crop rotations is its ability to rapidly accumulate biomass, which, when turned into the soil, significantly enhances soil organic matter. This increase in organic matter improves soil structure, water retention, and nutrient availability, leading to a more fertile and resilient soil ecosystem. Moreover, sunn hemp is an excellent nitrogen fixer, capturing atmospheric nitrogen and converting it into a form that subsequent crops can easily absorb. This natural fertilization process reduces the need for synthetic nitrogen inputs, lowering production costs and minimizing environmental impact.
However, while sunn hemp offers numerous benefits, there are also challenges associated with its cultivation. One potential issue is its allelopathic properties, which can inhibit the germination and growth of subsequent crops if not managed properly. This is due to compounds released by sunn hemp into the soil that can affect sensitive plants, or it can work to keep weeds out! Additionally, sunn hemp may pose a risk of becoming invasive if not carefully controlled. This risk underscores the importance of implementing appropriate management practices, such as timely mowing or incorporation into the soil before seed set, to prevent unwanted spread. Despite these challenges, the benefits of sunn hemp, particularly in terms of soil health enhancement and its role in sustainable agriculture practices, often outweigh the potential drawbacks, making it a valuable tool in the arsenal of organic farmers aiming for weed control and soil health benefits.
Good video about Sunn Hemp from Missouri research!
Cowpea
Cowpea (Vigna unguiculata) (picture above) serves as an excellent cover crop in a variety of agricultural systems, providing multiple benefits for soil health and weed management. Its ability to thrive in poor soil conditions, coupled with a relatively low requirement for water, makes cowpea a robust choice for enhancing soil fertility and structure, especially in regions prone to drought. As a leguminous plant, cowpea enriches the soil with nitrogen through symbiotic nitrogen fixation, a process where bacteria in cowpea roots convert atmospheric nitrogen into a form that plants can use. This natural fertilization boosts the nutrient content of the soil, reducing the need for synthetic fertilizers and thereby lowering agricultural input costs.
In terms of weed control, cowpea’s rapid growth and dense foliage provide an effective cover that suppresses weed emergence by significantly reducing light penetration to the soil surface, thus minimizing the growth opportunities for unwanted plants. The shading effect also helps in retaining soil moisture, further supporting the growth of the cowpea while inhibiting weed development (this effect is not nearly as effective because it is a shorter plant). Additionally, when cowpea is incorporated into the soil as green manure after its growth cycle, the organic matter added to the soil improves soil structure, enhances water retention, and stimulates the activity of beneficial microorganisms. However, it’s important to manage cowpea cover crops effectively to prevent them from becoming a weed themselves, as their vigorous growth can sometimes lead to challenges in controlling their spread if not timely mowed or incorporated into the soil. Overall, cowpea stands out as a versatile and beneficial cover crop, contributing to sustainable agricultural practices by improving soil health, enhancing nutrient availability, and providing effective weed suppression.
Winter Cover Crops
Winter cover is more difficult because we typically start to get land ready about the time our cover crops start to grow in February/March. Winter cover is almost always a small grain and most of the time we use a “combine run” wheat or oat since they are cheaper with a planting of turnips or daikon radish or both.
Cereal Rye
Cereal rye (not ryegrass), scientifically known as Secale cereale (pictured above), serves as an exceptional cover crop for a multitude of reasons, pivotal for enhancing agricultural sustainability and soil health. One of its foremost benefits is its robust root system, which significantly improves soil structure and enhances water infiltration. This characteristic is particularly valuable in preventing soil erosion and runoff, thus protecting water quality in the surrounding environment. Additionally, cereal rye’s ability to uptake residual nitrogen from the soil makes it an excellent tool for nutrient management, reducing the risk of nitrogen leaching into water bodies and thereby mitigating the environmental impact of nitrogen fertilizers.
Moreover, cereal rye acts as a natural weed suppressant due to its quick germination and fast growth, outcompeting weeds for light, nutrients, and space. The crop’s residue also provides a mulch that further suppresses weed growth and retains soil moisture, which is particularly beneficial in dryland farming systems. Furthermore, by providing a habitat for beneficial insects and microorganisms, cereal rye enhances biodiversity and contributes to the overall health of the agroecosystem.
This picture is from Carl Pepper near O’Donnell on the South Plains. It was planted last September into cotton plants. Seeding rate is 4.5 lbs. of Rye and 4.5 lbs. of Barley with 1 lb. of purple top turnips burned in the freeze.Holds the soil, uses very little if any moisture and is cheap to establish.
Short video of Roller Crimping a rye cover crop at pollination
Mustards
Using mustards as a cover crop is a practice rich in benefits for sustainable and organic agriculture. Mustards contribute significantly to soil health and pest management strategies without reliance on chemical inputs. They are known for their rapid growth, which quickly covers bare soil, reducing erosion and suppressing weed growth through competition. The deep rooting of mustards helps break up compacted soil layers, enhancing water infiltration and aeration for future crops. Perhaps most notably, mustards possess biofumigant properties; when incorporated into the soil, they release natural compounds that suppress a variety of soil-borne pathogens and pests (click here for a great project with mustard seed meal). This dual action of physical soil improvement and chemical pest suppression makes mustards an invaluable tool in the organic farmer’s toolkit, promoting a healthier, more productive soil ecosystem and paving the way for successful crop rotations.
“Caliente Rojo” mustard is a variety specifically bred for its biofumigation properties, which can play a significant role in organic agriculture, particularly in disease management and soil health improvement.
Biofumigation Properties: “Caliente Rojo” mustard, when incorporated into the soil, releases isothiocyanates (ITCs), which are naturally occurring compounds found in Brassica plants. These compounds have been shown to suppress a wide range of soil-borne pathogens, including fungi, bacteria, nematodes, and some weed species.
Soil Health Improvement: Beyond disease suppression, “Caliente Rojo” mustard contributes to soil health by adding organic matter, improving soil structure, and enhancing microbial activity. This leads to better water infiltration, aeration, and nutrient cycling in the soil.
Growth Habit: It has a fast growth rate, which quickly provides ground cover, reducing soil erosion and weed growth. Its deep rooting system can also help in breaking up compacted layers of soil, improving root penetration for subsequent crops.
Sowing: It is typically sown in the fall or early spring when the soil can be worked. The planting rate and spacing should be adjusted based on the specific goals (biofumigation, erosion control, etc.). Typical planting rate is 8 lbs./ac. but can be lower.
Incorporation: For biofumigation, the mustard should be mowed or chopped and immediately incorporated into the soil while it is still fresh. This action releases the biofumigant compounds.
Irrigation: After incorporation, irrigating the area can help in releasing the biofumigant compounds more effectively as they hydrolyze in the presence of water.
Vetch
Common vetch (Vicia sativa) and hairy vetch (Vicia villosa) are leguminous cover crops celebrated for their multifaceted benefits in sustainable agriculture. These species excel in nitrogen fixation, a process where atmospheric nitrogen is converted into a form that plants can use, enriching the soil and reducing the need for synthetic fertilizers. This attribute makes them particularly valuable in crop rotations, especially preceding nutrient-demanding crops. Hairy vetch, with its robust growth and cold tolerance, is particularly noted for producing a significant amount of biomass, which can improve soil structure and organic matter content.
Both common and hairy vetch exhibit vigorous root systems that enhance soil health by increasing porosity and water infiltration, thereby reducing erosion and improving drought resilience. Their dense foliage serves as an excellent weed suppressant by outcompeting weed species for sunlight and nutrients, which can lead to reduced herbicide reliance. Upon termination, the biomass of these vetch species acts as a natural mulch, conserving soil moisture and further suppressing weed growth. Additionally, the flowers of vetch attract beneficial insects, including pollinators and predatory insects, which contribute to the biodiversity and resilience of agroecosystems.
Hairy vetch, in particular, stands out for its ability to thrive in a wide range of soil conditions and its notable winter hardiness, making it an excellent choice for cover cropping in cooler climates where other legumes might fail to establish or survive. Hairy vetch will produce more residue than common vetch 1/3 to 1/2 more. Common vetch does tend to reseed and establish easier in a pasture system compared to hairy vetch. When used in a no-till farming system, the decomposing vetch residue can release nitrogen slowly over time, closely matching the nutrient uptake patterns of subsequent crops. This synchrony minimizes nitrogen leaching and maximizes nutrient use efficiency, showcasing the role of vetch not only in enhancing soil fertility but also in promoting more sustainable and environmentally friendly farming practices.
Wheat (Triticum spp.)
Advantages: Wheat is widely adaptable, with a deep root system that improves soil structure and enhances water infiltration. It’s excellent for erosion control and can be a good scavenger of residual soil nitrogen, reducing nitrate leaching. Wheat also serves as a decent biomass producer in cooler climates.
Best For: Erosion control, nitrogen scavenging, and when a crop that can survive a wide range of conditions is needed.
Oats (Avena sativa)
Advantages: Oats are fast-growing and establish quickly, providing rapid ground cover to outcompete weeds and reduce erosion. They produce significant biomass, which can improve soil organic matter. Oats also die off in freezing temperatures, which makes them easy to manage in the spring.
Best For: Quick cover to outcompete weeds, adding organic matter to the soil, and as a winter-kill cover crop in regions with cold winters.
Barley (Hordeum vulgare)
Advantages: Barley establishes quickly and can provide a good ground cover and weed suppression. It’s more drought-tolerant than oats and can be used in areas with lower water availability. Barley also contributes to soil health by adding biomass and improving soil structure.
Best For: Fast establishment, drought-prone areas, and effective weed suppression.
Triticale (× Triticosecale)
Advantages: Triticale, a wheat and rye hybrid, combines the best traits of both parents. It offers a robust root system, excellent biomass production, and good tolerance to both poor soil conditions and colder temperatures. Triticale is also notable for its nutrient scavenging ability and can be used to improve soil fertility.
Best For: Biomass production, nutrient scavenging, and versatility in both cold and marginal soil conditions.
Daikon Radish or Tillage Radish
Daikon radish, often referred to as tillage radish, has gained popularity as a cover crop for its unique ability to improve soil structure and health through natural biotillage. Characterized by its rapid growth and large, penetrating taproot, tillage radish drills through compacted soil layers, creating channels that enhance air and water infiltration. This deep penetration also helps to break up hardpans, reducing the need for mechanical soil tillage, hence the name “tillage radish.”
One of the standout benefits of tillage radish is its capacity to capture excess nutrients from the soil profile. The deep roots absorb nitrogen and other nutrients, which are then stored in the plant’s tissue. When the radishes decompose in the spring, these nutrients are released back into the soil, becoming available for the next crop. This nutrient recycling can improve crop yields while reducing the risk of nutrient runoff into waterways, contributing to more sustainable farming practices.
Tillage radish also contributes to weed suppression. The rapid, dense canopy formation shades out weeds, reducing their ability to establish. This effect can carry over into the spring, providing a cleaner start for the next crop. Additionally, the decaying radish residue leaves behind significant organic matter, contributing to soil organic matter content and overall soil health. This organic matter feeds soil microorganisms, which play a critical role in maintaining soil fertility.
Moreover, the winter die-off of tillage radish eliminates the need for chemical or mechanical termination, simplifying spring field operations. This characteristic makes it an attractive option for farmers looking to reduce labor and input costs associated with cover crop management. The holes left by the decomposing radishes can also improve soil aeration and provide pathways for the roots of subsequent crops, potentially enhancing root development and access to deep soil nutrients.
Purple Top Turnip
Purple top turnip is a cover crop that has been used for years in Texas. The seed is relatively cheap, serves as winter grazing if needed, grows fast and adds lots of organic matter. It is known for its rapid growth and adaptability to a wide range of soil types, this cover crop is an excellent choice for farmers looking to enhance soil structure, suppress weeds, and improve nutrient cycling within their farming systems. The large, leafy greens of the purple top turnip create a dense canopy that can quickly cover the ground, effectively suppressing weed growth by outcompeting weeds for sunlight and nutrients.
Scales are sucking insects that insert their tiny, straw-like mouthparts into bark, fruit, or leaves, mostly on trees and shrubs and other perennial plants. Some scales can seriously damage their host, while other species do no apparent damage to plants even when scales are very abundant. The presence of scales can be easily overlooked, in part because they do not resemble most other insects.
Lecanium scales in the picture above (there are about 12 species) are known as “soft” scales and are common pests on many ornamental plants all over North America. Holly, elm, redbud, walnut, citrus, apricot, pear, persimmon, beech, box elder, grape, pecan, rose, and willow are a sample of the diverse range of hosts that Lecanium scales can parasitize.
As these scales feed, they excrete large quantities of honeydew which serves as a substrate for sooty mold fungi.
Here is a link to a previous post I wrote about this scale on pecan. Scale on Pecan?
San Jose Bark Scale
San Jose scale, Quadraspidiotus perniciosus (Comstock) (Homoptera: Diaspididae). Photo by C. L. Cole.
San Jose Bark Scale is one of the major insect pests of peaches and maybe one that causes the most damage. The first signs of infestation include a decline of tree vigor, leaf drop and appearance of sparse yellow foliage, particularly on the terminal growth. Reddish spots on the underside of bark and around scales on leaves or fruit result from feeding of immature stages. In severe cases, the entire surface of bark can become covered with layers of overlapping grayish scales. Cracking and bleeding of limbs occur, and heavily injured trees may die.
Life Cycle: Intermediate. Mature females and immature (second nymphal instar) stages survive the winter. Rather than eggs, female scale insects produce tiny six-legged, mobile, yellow-colored young, called “crawlers.” This stage spreads the infestation to new areas on the host plant, including bark, leaves and fruit, and to new hosts. After inserting their thread-like mouthparts into the plant and feeding for 2 to 3 days, female crawlers secrete their initial scale coverings and never move from that spot. Males develop into 2-winged adults in 2 or 3 weeks and emerge from their scales to seek females to mate. Up to six generations may be produced annually. All stages of development can occur throughout the year except during the winter.
Crape Myrtle Bark Scale
The crape myrtle bark scale, Acanthococcus (Eriococcus) lagerstromiae (Kuwana) was first confirmed in the USA in 2004 in the landscape near Dallas (TX), although it was likely introduced earlier. The scale is a sucking insect that feeds on the phloem (sap) of plants. As it feeds, it excretes a sugary solution known as “honeydew” (similar to aphids, whiteflies, and other sucking insects). Heavy infestations of crape myrtle bark scale produce sufficient honeydew to coat leaves, stems and bark of the tree. This honeydew, in turn, will eventually turn black as it is colonized by a concoction of fungi, called sooty mold. Although crape myrtles rarely die as a result of crape myrtle bark scale infestation, the sticky leaves and black trunks greatly reduce the attractive appearance of the tree.
Photo by Erfan K. Vafaie, Texas A&M AgriLife Extension.
Immature crape myrtle bark scale is hard to see with the naked eye, but adult scale covers, and egg sacs are frequently visible on the upper branches and trunk of the tree. These scales include larger, white, oval (female) and smaller, elongate (male) scales. Both male and female scales of the crape myrtle bark scale are immobile and will “bleed” pink blood when crushed.
On a personal note, this is a problem I have in my landscape and use Certis Biologicals – Des-X Insecticidal Soap as a treatment. Seems to work well but it does require repeat applications.
Mealybugs are prominent now in Greenhouses and Houseplants
Mealybugs are soft-bodied, wingless insects belonging to the family Pseudococcidae. These pests are known for their damaging effects on a wide range of plants, including crops, ornamentals, and houseplants. Their appearance is distinctive: adults are covered with a white, waxy, cotton-like secretion, making them resemble small tufts of cotton. This protective coating helps conserve moisture and offers some defense against predators and pesticides. Understanding the biology of mealybugs is crucial for developing effective management strategies in agricultural and horticultural systems.
Mealybugs have a complex life cycle that includes egg, nymph (crawler), and adult stages:
Egg: Female mealybugs lay hundreds of eggs within an ovisac, a protective sac made from waxy secretions. The color and size of the ovisac can vary among species.
Nymph (Crawler): After hatching, the nymphs, or crawlers, emerge to find feeding sites. This is the most mobile stage of the mealybug life cycle, and it’s when they are most vulnerable to control measures. Crawlers are tiny, yellowish, and lack the waxy coating seen in adults.
Adult: As they mature, nymphs undergo several molts before reaching adulthood. Adult females are larger than males and retain the waxy coating. Males may develop wings, depending on the species, and do not feed on plant sap as adults.
Mealybugs feed by inserting their long, slender mouthparts into plant tissues and sucking out sap. This feeding behavior can weaken plants, reduce growth, and cause leaf yellowing, wilting, and even death in severe infestations. As they feed, mealybugs excrete honeydew, a sticky substance that can lead to the growth of sooty mold, further impairing photosynthesis and plant health.
Mealybug reproduction can be sexual or asexual, varying by species. Some species are capable of parthenogenesis, where females produce offspring without mating. This ability allows for rapid population increases under favorable conditions.
Mealybugs spread primarily through human activity, such as the movement of infested plant material, and natural means, like crawling to adjacent plants or being carried by wind, animals, or ants. Ants, in particular, are known to farm mealybugs for their honeydew, protecting them from natural enemies and inadvertently aiding in their dispersal.
Introduction of Natural Predators or Disease
Controlling scale or mealybug insects in an organic farming system emphasizes the integration of biological and ecological methods to maintain pest populations below damaging levels. Biological control, one of the cornerstone practices in organic agriculture, involves the use of living organisms—predators, parasitoids, and pathogens—to regulate pest populations. Here are some effective methods to manage these insects through biological or predator-based strategies:
Lady Beetles (Coccinellidae): Many lady beetle species are voracious predators of scale insects in their larval and adult stages. For instance, the vedalia beetle (Rodolia cardinalis) has been successfully used to control cottony cushion scale in citrus groves.
Cryptolaemus montrouzieri: Often referred to as the mealybug ladybird, this beetle is a voracious predator of mealybugs in both its larval and adult stages. It has been used successfully in various agricultural systems to control mealybug populations.
Lacewings (Chrysopidae): Green and brown lacewings consume scale insects during their larval stages. Green lacewing larvae are effective predators of mealybugs, consuming them at various stages of their development. Their larvae are known as “aphid lions” for their predatory efficiency.
Parasitic Wasps: Tiny wasps, such as Aphytis melinus and Encarsia spp., specialize in parasitizing scale insects. They lay their eggs in or on the scale insect, and the developing larvae consume the scale from the inside. Several species of parasitic wasps, such as Leptomastix dactylopii, target mealybugs specifically. These wasps lay their eggs in or on mealybug larvae, and the hatching wasps consume the mealybugs from the inside.
Beauveria bassiana and Metarhizium anisopliae are fungi that infect and kill a wide range of insect pests, including scale and mealybug insects. These fungi are particularly useful in humid environments where they can naturally proliferate and infect scale populations.
Isaria fumosorosea (formerly known as Paecilomyces fumosoroseus) is a naturally occurring entomopathogenic fungus that acts as a biological control agent against a wide range of insect pests, including mealybugs, aphids, whiteflies, thrips, and other soft-bodied insects. It infects its hosts through the cuticle, leading to the pest’s death, and is particularly useful in integrated pest management (IPM) systems in organic agriculture and greenhouse settings.
Below you will see a list of organic products that have scale and/or mealybugs on their labels. These include some of the beneficial fungi listed above as well as botanical oils and the still very popular Azadirachtin extracted from the neem tree. You can just look through this short list or click on the link below to either see it on your computer or download and use as an Excel file.
Texas A&M AgriLife Organic 