The most recent fertilizer phosphorus (P) and potassium (K) rate recommendations for corn and soybeans grown in Ohio were published in the mid-90s and follow the buildup, maintenance, and drawdown approach. Validation of recommendations using today's farming practices is needed. In this study, fertilizer P and K application rates estimated to equal or exceed crop removal were applied and resulting corn and soybean grain yield and soil test P and K trends were observed throughout nine years of production at three sites in Ohio.
Tunsisa and Steve recently published a paper on their work in active organic matter. In their manuscript, they examined the relationship between POXC and mineralizable C across a wide range of soil types, management histories, and geographic locations in the U.S. They also investigated the ability of POXC and mineralizable C to predict crop yield and total aboveground biomass.