Northern Research and Demonstration Farm
A study was initiated in 1994 to evaluate phosphorus (P) and potassium (K) fertilizer placement for corn and soybeans managed with no-till or chisel plow tillage. Tillage may affect crop yield and many soil properties. No-till management results in little incorporation of residues and fertilizers into the soil. Therefore, broadcast fertilization could be inefficient in no-tilled soils because P and K accumulate at or near the soil surface. The study consists of two trials: one P trial and one K trial. Corn and soybeans are grown each year by alternating crops between two halves of the area of each trial. Webster is the predominant soil but there are some areas of Canisteo. Treatments are applied for both crops, which are planted with a 30-in. row spacing. The chisel plow system involves chisel plowing of cornstalks in the fall and field cultivation in the spring, while soybean residue is field cultivated in the spring.
Iowa State University
Mallarino, Antonio P. and Rueber, David, "Phosphorus and Potassium Fertilization and Placement Methods for Corn-Soybean Rotations Managed with No-Till and Chisel Plow Tillage" (2005). Iowa State Research Farm Progress Reports. 1257.