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A long-term experiment was established at the ISU Northern Research Farm, Kanawha, Iowa, in 1998 to study phosphorus (P) fertilization of alfalfa. Alfalfa has higher P demand than corn or soybean, and soil-test P interpretations and P fertilization guidelines in Iowa State University extension publication PM-1688 (A General Guide for Crop Nutrient and Limestone Recommendations in Iowa) are based on research more

Alfalfa Hay and Soil-Test Phosphorus Responses to Long-term Phosphorus Fertilization Strategies