Modifications to Increase Vegetable Earliness and/or Yield

Getting vegetables to market earlier can improve both production opportunities and profitability. This article reviews practical ways to increase earliness and yield, including variety selection, windbreaks, frost protection, row covers, plastic mulch, healthy transplants, drip irrigation, fertility and staggered planting.

Topics Covered in This Article!

Light, sandy soils warm up faster than heavier, poorly drained soils. Of course, we don’t always have a choice, but if you are going to spend money on transplants and fertilizer, choose your best land for vegetables. The heat to warm up wet soil 1 degree will heat up dry soil 15 degrees.

Check the days to maturity. There is a big difference between many varieties, and this area needs careful consideration. The early variety may not be the best overall, but it can get you into the market earlier, which can be advantageous.

View of agricultural rows with green grass on either side, featuring black plastic mulch covering the soil and white protective covers placed along the rows.

This is perhaps the most important based on work I have done with melons. Windbreaks can decrease time to maturity by a week. Windbreaks are simply plantings with taller plants done weeks or months before your vegetable crop is planted. For example, a rye crop planting in October will be heading out when you plant melons April 1st. The melon crop is stripped into the standing rye.

In the past, I have worked with growers who went to the trouble and expense to bring in helicopters when an early morning freeze was predicted. It is not unusual to see vineyards with ‘wind machines’ to circulate air when a frost is predicted. Water sprinklers will coat plants with ice which is a freeze protection – sounds crazy I know! Some orchard owners will have bales of hay they set on fire to generate a smoke layer that holds in heat. The basic message is to be prepared if you plant early.

An orchard with fruit trees covered in a layer of frost, surrounded by a hilly landscape under a clear sky, with water misting from sprinklers
Rows of crops covered with protective plastics in a farm field, showing green plants growing in the soil.

High-value crops like strawberries really benefit from the use of row covers. These can be expensive, so the crop must generate good income to justify the cost. Floating row covers can protect plants from early-season pests and cold temperatures, allowing for earlier planting and faster growth (4 above). These covers can be removed once the danger of frost has passed or may be left on to protect from insect pests.

These increase earliness by warming the soil, conserving moisture, preventing weed problems, and increasing total plant yields. In our Texas soils, plastic mulch can also help keep the plant row from becoming too wet or too dry.

A wide view of a farm field with rows of crops, featuring green plants growing on black plastic mulch and surrounded by patches of dry grass.

Transplants will greatly increase earliness but only if the transplant is healthy and vigorous. You must use organic sourced transplants! Currently we are working to develop better organic transplants and methods for growing transplants in a TDA supported Specialty Crop Grant. Some transplants that have been grown too long in the greenhouse don’t do well in the field so check your source constantly for when they will be ready so you will be ready.

Providing water in small amounts often is the job of drip irrigation. Used with plastic mulch, drip irrigation increases earliness and yield. Drip irrigation is fairly easy to install and relatively inexpensive. You generally need a pressure regulator, filter, hoses or pipes to carry the water and drip tape to deliver to the crop.

High levels of nutrients ensure rapid growth and utilization of water and sunlight. Many growers struggle to provide stored nutrients in soil, provide pop-up nutrients at planting, and fertilize with organic nitrogen sources through harvest. Regular soil testing helps determine nutrient deficiencies and allows for proper soil amendment before planting. Balanced soil fertility is crucial for early and vigorous plant growth.

Effect of fulvic acid on yield performance of organic bell
pepper (Capsicum annuum L.) under open‑field conditions
in Tennessee. 2023

Certain growth-promoting substances, like seaweed extracts or microbial inoculants or even Fulvic Acid, can enhance earliness, plant growth and development, potentially leading to earlier harvests.1

Planting in staggered intervals (planting tomatoes on a 2-week schedule) can help manage for frost losses and increase the harvest window and ensure a continuous supply of produce, allowing entry into the market over a longer period.

References

  1. Kanabar, P., & Nandwani, D. 2023. “Effect of Fulvic Acid on Yield Performance of Organic Bell Pepper (Capsicum annuum L.) Under Open-Field Conditions in Tennessee.” Organic Agriculture 13: 431–441. ↩︎

Text from the USDA National Organic Program detailing the Transition to Organic Partnership Program.

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Author: Bob Whitney

Regents Fellow & Extension Organic Specialist, Texas A&M AgriLife Extension

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