Fertility

Prior to field preparation, have soil tested to establish baseline pH and nutrient levels. Manage nutrients according to soil test results, soil types, and region-specific guidelines presented in Table 1, below. Note the following general considerations:

Maintain a pH of 6.5. In regions where clubroot is a concern, apply lime to rasie pH into the range of 6.8 – 7.2.

Boron can be applied as an additive to fertilizer. See table for the recommended amount for your area.

Fertilizer inputs are generally split into multiple applications timed to critical stages in plant growth. Base inputs on soil test results, and do not exceed total recommended amounts for your region. Include nitrogen credits in total inputs.

Abnormalities can result from overfertilizing as well as from nutrient deficiencies. For example, hollow stem can result from too little boron or too much nitrogen.

New England

Recommended Nutrients Based on Soil Tests
If soil levels of boron are low, apply 3 lbs. boron per acre as an additive to fertilizer before planting  Nitrogen lbs/acre P2O5 lbs/acre K2O lbs/acre
Soil Phosphorus Level Soil Potassium Level
very low low opti-mum above opti-mum very low low opti-mum above opti-mum
Total Recommended 160 150 100 50 0 175 120 50 0
Broadcast & incorporate 100 150 100 50 0 175 125 50 0
Sidedness 4 weeks after transplant 60 0 0 0 0 0 0 0 0

Source: University of Massachusetts Amherst.  2016-2017 New England Vegetable Management Guide: Cabbage, Broccoli, Cauliflower, and Other Brassica Crops.

New York

Recommended Nutrients Based on Soil Tests
Add 1 to 2 lbs boron/acre to fertilizer Nitrogen lbs/acre P2O5 lbs/acre K2O lbs/acre
Soil Phosphorus Level Soil Potassium Level
low med optimal low med optimal
Total Recommended 100-120 120 80 40 160 120 60
Broadcast & disk-in 40 80 40 40 120 80 40
Band place with planter 40 40 40 0 40 40 20
Sidedress 4 weeks after seeding or transplanting 20-40 0 0 0 0 0  0

Source: Cornell Cooperative Extension. 2013. Integrated Crop & Pest Management Guidelines for Commercial Vegetable Production. Chapter 15: Cabbage, Broccoli, Cauliflower, and Brussels Sprouts.

 

Mid-Atlantic

Recommended Nutrients Based on Soil Tests
Apply 1.5 to 3 lbs. boron per acre in mixed fertilizer Nitrogen lbs/acre P2O5 lbs/acre K2O lbs/acre
Soil Phosphorus Level Soil Potassium Level
low med high (opt.) very high low med high (opt.) very high
Total Recommended 150-200 200 100 50 01 200 100 50 01
Broadcast & disk-in 50-100 200 100 50 01 200 100 50 01
Sidedress 2 to 3 weeks after planting 50 0 0 0 0 0 0 0 0
Sidedress  4 to  6 weeks after planting 50 0 0 0 0 0 0  0 0

1 Recommendation for Virginia is 25 lbs/acre
Source: Rutgers NJAES Cooperative Extension Publication E001. 2016 – 2017 Mid-Atlantic Commercial Vegetable Production Recommendations.

Southeast

Recommended Nutrients Based on Soil Tests
Apply 1.5 to 3 lbs. boron per acre in mixed fertilizer Nitrogen lbs/acre P2O5 lbs/acre K2O lbs/acre
Soil Phosphorus Level Soil Potassium Level
low med opti-mal very high low med opti-mal very high
Total Recommended 125-170 200 100 50 0 200 100 50 0
Broadcast & disk-in 50-100 150 100 50 0 150 100 50 0
Sidedress 2 to 3 weeks after planting 50 50 0 0 0 50 0 0 0
Sidedress every 2 to 3 weeks after initial sidedressing 25 0 0 0 0 0 0  0 0

Source: Southeastern Vegetable Extension Workers. 2017 Southeastern U.S. Vegetable Crop Handbook.

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