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Find phosphorus and potassium recommendations, micronutrient recommendations, and limestone recommendations for soils.
Also find soil test procedures and categories.
Iowa State University Extension and Outreach
Ames, IA, United States
Agriculture | Agronomy and Crop Sciences | Soil Science
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Mallarino, Antonio P.; Sawyer, John E.; and Barnhart, Stephen K., "A General Guide for Crop Nutrient and Limestone Recommendations in Iowa" (2013). Extension and Outreach Publications. 82.