Southeast Research and Demonstration Farm
A study was initiated in 1994 to evaluate longterm effects of phosphorus (P) and potassium (K) fertilizer rates and placement methods on yield of corn and soybean managed with notill or chisel-plow tillage. No-till management results in little or no incorporation of residue and fertilizer with soil. Therefore, broadcast fertilization could be inefficient with no-till because both nutrients accumulate near the soil surface. In this case, subsurface banding of P and K fertilizers could be more effective.
Iowa State University
Mallarino, Antonio P. and Van Dee, Kevin, "Long-term Study of Phosphorus and Potassium Placement Methods for Corn and Soybean Managed with No-till or Tillage" (2011). Iowa State Research Farm Progress Reports. 280.