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11. Nutrient Management
Applying the correct amount and form of plant nutrients for optimum yield and minimum impact on water quality.
| How it works |
After taking a soil test, setting realistic yield goals, and taking credit for contributions from previous years' crops and manure applications, crop nutrient , needs are determined. Nutrients are en applied at the proper time by the proper application method. Nutrient sources include animal manure, biosolids, and commercial fertilizers. These steps reduce the potential for nutrients to go unused and wash or infiltrate into water supplies.
| How it helps |
Sound nutrient management reduces input costs and protects water quality by preventing over-application of commercial fertilizers and animal manure.
Correct manure and biosolids application on all fields can improve soil tilth and organic matter.
| Planning ahead |
Have you tested your soil and livestock manure for their nutrient levels?
Are organic wastes or biosolids available for you to use?
Have you calibrated your spreader to apply the volume of manure called for according to plant needs and nutrient value of manure?
Have you determined realistic yield goals?
Are proper soil conservation measures installed?
Have you accounted for nitrogen credits produced by legume crops?
Do phosphorus levels in the soil pose a potential problem?
| Tech notes |
- Choose the best application method. Use broadcast, starter, surface band or injection.
- Use the pre-sidedress nitrogen test, as appropriate, when corn plants are between 6 to 12 inches tall.
- Avoid applying manure on frozen or snow-covered ground, if possible.
- Consider using a fall cover crop to uptake residual nitrogen.
| Maintenance |
Test soils a minimum of once every three years.
Analyze manure and other organic waste for nutrient content before field application.
Establish a winter cover crop if there's a possibility of nitrogen leaching because of poor crop yield.