Phosphorus and Potassium Placement for Corn and Soybeans Managed with No-till and Chisel-Plow Tillage

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