Northwest and Allee Research and Demonstration Farm
Iowa research has provided much information about P and K management for corn and soybeans, but it has been mostly based on broadcast fertilization for tilled soils. No-till management results in little or no incorporation of residues and fertilizers with soil. Subsurface banding of phosphorus (P) and potassium (K) fertilizers with planter attachments or before planting could be more effective because both nutrients accumulate at or near the soil surface. A long-term study was initiated in 1994 at this farm and at other farms to evaluate P and K fertilizer placement for corn and soybeans managed with no-till and chisel-plow tillage.
Iowa State University
Mallarino, Antonio P. and Haden, David, "Phosphorus and Potassium Fertilizer Placement for Corn and Soybeans Managed with No-till and Chisel-Disk Tillage" (2004). Iowa State Research Farm Progress Reports. 1367.