The question that is often asked is just how much nutrient is being removed with that baling of straw around the state?
From a pure fertilizer standpoint, wheat straw contains very little in terms of phosphorus (P2O5) but moderate amounts of nitrogen (N) and potassium (K2O), said Robert Mullen, director of agronomy, Potash Corp/PCS Sales. The actual amounts of N, P2O5, and K2O contained in a ton of wheat straw are 11, 3, and 20 pounds, respectively (or an analysis of 0.6-0.2-1 if it were printed on a fertilizer bag).
“These removal rates are based upon average nutrient removal estimates from various publications,” Mullen said.
Some estimates of nutrient removal can be based upon grain yield, but those estimates have an underlying assumption, he said. The Tri-State Fertilizer Recommendations have a K2O removal of 0.91 pounds per bushel of grain.… Continue readingRead More »