Soybean yields have been gradually increasing due to genetic and management improvements. Traditionally, soybeans are grown without nitrogen fertilization. However, in high-yield scenarios, particularly under irrigation, they may not have the ability to fix or obtain enough N to maximize yields. Some of the sandy and low organic matter soils in Delaware may not be able to supply sufficient sulfur in a high-yield scenario. This project gathered local data on locally on applying supplemental N and S to irrigated full-season and double-cropped soybeans via fertigation, as farmers have reported positive yield responses to this practice at flowering, beginning pod or beginning seed fill growth stages.

Key Benefactors:
farmers, agronomists, Extension agents