1. Soil Health Indicators help with Fertilizer Application Decisions in South Dakota Corn

Fertilizer inputs are an essential part of corn (Zea mays) cropping systems in the United States.  In South Dakota, phosphorus and potassium yearly inputs are based on  soil test nutrient levels and a yield goal while sulfur is based on soil texture and tillage practices. These 3 plant nutrients have a point called the “critical value” where addition of more of the nutrient as an inorganic fertilizer should no longer result in a yield increase. These fertilizer critical... B. Groebner, J. Clark