Northwest and Allee Research and Demonstration Farm
This study was conducted to determine crop and soil test responses to phosphorus(P)fertilizer on a soil determined to be responsive to this nutrient. Specifically, we wanted to determine which of five soil extractants would best determine plant available P.
Iowa State University
Henning, Stanley, "Corn, Soybean, and Soil Responses to Phosphorus Fertilizer" (2007). Iowa State Research Farm Progress Reports. 948.