Northeast Research and Demonstration Farm
Compared with tillage, no-till management can change many soil properties and crop yields. Broadcast phosphorus (P) and potassium (K) fertilization may be inefficient in no-till because both nutrients accumulate near the soil surface. Banded fertilization could be more effective. A study was initiated in 1994 to compare no-till and chisel plow tillage and fertilizer placement methods for corn-soybean rotations. The study included four trials: P for corn, P for soybeans, K for corn, and K for soybeans. Both crops are grown each year by alternating them between adjacent field areas. The soil is mainly Floyd series, and initially tested Very High in P and High in K. Treatments were applied for both crops, which were planted in 30-in. row spacing. Cornstalks of plots managed with tillage were chisel plowed in the fall and field cultivated in the spring, whereas soybean residue was only field cultivated in the spring.
Iowa State University
Mallarino, Antonio P. and Pecinovsky, Kenneth T., "Phosphorus and Potassium Placement Methods for Corn and Soybeans Managed with No-Till and Chisel Plow Tillage" (2005). Iowa State Research Farm Progress Reports. 1248.