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 | Great Plains U.S. |
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| North and West Zone India |
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| Northcentral China |
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| IA-10F | Removal of Phosphorus in Corn and Soybean Grain as Related to
Long-Term Crop Yield and Soil-Test Phosphorus | |
| IL-31F | Effects of High Residual Phosphorus and Potassium Soil Test Levels on Soybean Yields and Incidence of Asian Soybean Rust | |
| IL-35F | Assessing Nutrient Profiles in Illinois Soils | |
| IN-14F | Potassium and Phosphorus Effects on Yield Components, Tissue Nutrient Concentrations, and Fertilizer Efficiency in Alfalfa | |
| MN-20F | Precision Placement for Improved Phosphorus Management of Corn - Soybean Rotations in Very Reduced Tillage Systems | |
| MN-21F | Establishing Local Studies to Investigate the Economics of Variable Rate Phosphorus and Potassium Fertilization | |
| MN-25F | Crop Responses to Soil Amended with Turkey Manure Incinerator Ash | |
| SD-11F | A Participatory Study of Site-specific Yield Response to Phosphorus: An Assessment of Participation by South Dakota Extension Agronomy Educators | |
| Northeast India & Bangladesh |
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| Northern Latin America |
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| South Zone India |
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| Southeast China |
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| Southern and Eastern Russia |
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| Southern India & Sri Lanka |
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| Southern Latin America |
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| Western Canada |
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| plant analysis |
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| potassium |
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