Effects of sulfur application on yield and composition of soybeans and soil sulfur

Soybeans (Wayne cultivar) were grown on Mexico silt loam at four soil applied S levels over 4 years. The innate sulfur level of this soil appeared to be adequate for optimum grain yield. The additional sulfur had no effect on grain yield, oil concentration, essential amino acids and sulfur concentration in the seed. Sulfur extraction from profile cores after the study indicated movement of sulfur from the Ap into the upper B horizon over the course of the study. The soil sulfur test was improved when pHs was included in an expression for the Ap horizon.