Armstrong Research and Demonstration Farm
No-till minimizes the incorporation of crop residue and fertilizer with soil; resulting in wetter, colder soils and the accumulation of organic matter, phosphorus (P), and potassium (K) near the soil surface. Banding of P and Kcould be more effective than broadcast fertilization by counteracting stratification, applying nutrients in the root zone (starter effect), and minimizing reactions with the soil that may reduce their availability to plants. Therefore, a long-term study was established in 1994 to evaluate P and K fertilizer rates and placement methods for grain yield of corn and soybean managed with no-till and chiselplow/disk tillage.
Iowa State University
Mallarino, Antonio P.; Schwarte, Kirk; and Havlovic, Bernard J., "Broadcast and Band Phosphorus and Potassium Placement for Corn and Soybean Managed with Till or No Till" (2012). Iowa State Research Farm Progress Reports. 3.