Using best management practices and technology might allow some North Carolina fields to yield more than 70 bu/A. Although soil test phosphorus and potassium levels have been recently confirmed as sufficient, it is unclear if these levels are sufficient for high-yielding soybeans. Recalibration of soil test P and K for high-yielding soybeans is the objective of this research. It investigates the necessity of higher rates of phosphorus and potassium for high-yielding soybeans and optimal levels of P and K in plant tissue compared with regular soybean yields. Efforts also determine the exportation of P and K by grain in high-yielding soybeans, all to help determine if P and K recommendations should be modified based on yield expectations.

Key Benefactors:
farmers, agronomists, extension agents