Southeast Research and Demonstration Farm
This study was initiated in 1994 to evaluate P and K fertilizer placement methods for corn and soybeans managed with no-till and chisel-plow tillage. The study consists of four trials: P for corn, P for soybeans, K for corn, and K for soybeans. Corn and soybeans are grown in a rotation by alternating crops each year between adjacent areas with Mahaska and Nira soils. Treatments are applied for both crops. Cornstalks of plots managed with chisel-plow tillage are chisel plowed in the fall and field cultivated in the spring, whereas soybean residues are field-cultivated in the spring. Crops are planted using 30-inch row spacing, Yetter bubble-type coulter blades, Yetter 2976 series dry fertilizer coulters, and Martin residue managers.
Iowa State University
Mallarino, Antonio P. and Van Dee, Kevin, "Phosphorus and Potassium Placement for Corn and Soybeans Managed with No-till and Chisel-Plow Tillage" (2003). Iowa State Research Farm Progress Reports. 1535.