The main loss mechanism for phosphorus and potassium is erosion. Some P and K will be lost in runoff, but the amounts should be low if fertilizer was applied and incorporated several weeks before the recent rains. These losses are of greatest concern on well-drained (sandy) soils.

Sulfur (as sulfate) is very mobile in soils, especially in sandy soils. Fields should be monitored for visual symptoms of sulfur deficiency. Sulfur deficiencies symptoms tend to appear in young tissue as this nutrient is not translocated from older tissue parts, but may appear as a uniform yellowing of the entire corn seedling before V6. If a sulfur deficiency is confirmed, then 50 to 75 pounds per acre of ammonium sulfate should be applied.