Use spinner spreaders only where vegetative field borders are provided to trap misapplied nutrients. The main limitations of these spreaders are their higher initial cost and more complex operation. All fertilizer spreaders should be calibrated for the proper application rate and distribution pattern. Monitor all broadcast application methods carefully. Do not broadcast fertilizer when it is windy.
Wind can cause drift from liquid applicators and misplacement of dry materials.
Precision placement is possible with drip-tube irrigation, but sprinkler irrigation has the same limitations as spinner spreaders. Nutrients should not be applied through sprinkler irrigation systems unless vegetative buffers are provided. Time Nitrogen Applications Appropriately . The timing of application is more important with nitrogen than with any other nutrient because nitrogen is applied in large amounts to many crops and is very mobile. Phosphorus is very stable once it is mixed into the soil and can be applied when most convenient.