Western Research and Demonstration Farm
All cropping systems require fertilizer inputs in order to maintain crop yields. However, excess fertilizer, especially nitrogen and phosphorus, can increase problems with water quality. Starter fertilizer applied with the corn planter has been shown to sometimes increase corn yields. It is important for farmers to use the appropriate rates and methods of fertilizer application to optimize corn yields and minimize the impact on the environment.
Iowa State University
Fawcett, Jim; Rogers, Jim; Rossiter, Lyle; Roush, Wayne; and Sievers, Josh, "On-Farm Corn Fertilizer Trials" (2015). Iowa State Research Farm Progress Reports. 2267.