Northeast Research and Demonstration Farm
Continued no-till management can change many soil properties and crop yield compared with tillage. Broadcast phosphorus (P) and potassium (K) fertilization with no-till results in significant accumulation of both nutrients near the soil surface and, therefore, subsurface band fertilization could be more effective. A study was initiated in 1994 to compare no-till and chisel-plow tillage and fertilizer placement methods for a corn-soybean rotation. Floyd is the predominant soil, and the area initially tested Very High in P (33 ppm, Bray-1) and Optimum in K (140 ppm). The study includes four trials: P for corn, P for soybean, K for corn, and K for soybean. Both crops are grown each year by alternating adjacent areas. Treatments are applied for both crops, which are planted using a 30-in. row spacing. Cornstalks of plots managed with tillage are chisel-plowed in the fall and field-cultivated in spring. Soybean residues only are field cultivated in 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" (2008). Iowa State Research Farm Progress Reports. 751.