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Crops

Understanding Soil Phosphorus. University of Wisconsin Extension 2002
Agricultural Phosphorus Management and Water Quality Protection in the Midwest (pdf). Iowa State University, Kansas State University, University of Missouri, Columbia; University of Nebraska, Lincoln, EPA Region 7. 2005
Agricultural Phosphorus and Eutrophication (pdf). USDA Agricultural Research Service. 1999.
MSU Nutrient Recommendations Calculator (html)
N-P-K Fertilizers (pdf)
Phosphorus for Crop Production (pdf)
Soil testing procedures (pdf)
MSU Phosphorus Recommmedations (doc)