Extension Soil Scientist
This year the crops have matured early and harvest is moving ahead of normal. With a large amount of the soybeans and corn coming out, thoughts are turning to getting fertilizer applied for next year's crop. For phosphorus and potassium, there are very few problems with an early fall application. These nutrients are not mobile in most soils. The only big concern with a broadcast application of P and K is getting the fertilizer incorporated into the soil so it is in a place for the plant roots to utilize them next spring. Incorporation also reduces the chances of P and K being lost through erosion.