Michigan State University Extension
Soils & Soil Management - Fertilizer - 06029705
07/10/97
Fertilizer Recommendations for Field Crops in Michigan Extension Bulletin E-550A, March 1992
D. R. Christenson, D. D. Warncke, M. L. Vitosh, L. W. Jacobs and J. G. Dahl, Department of Crop and Soil Sciences
Numerous field studies conducted throughout the state provide the basis for these fertilizer recommendations. Soil test values of the plow layer have been correlated with crop responses to fertilizer nutrients. Where data for a specific crop and/or soil are unavailable, nutrient recommendations are based on field data from similar soil and crop systems, nutrient removal of the crop and experiences in other states on similar crops.
Phosphorus and potassium recommendations provided by the MSU Soil Testing Laboratory provide for a buildup when soil tests are low, maintain desirable nutrient levels when soil tests are medium to high, and allow for a gradual decrease in nutrient levels when soil tests are very high. To determine if a recommendation will result in a buildup or maintenance of the present soil test level, use (Vis. 1). A maintenance recommendation equals crop removal of nutrients, whereas a buildup recommendation exceeds removal.
The soil test for phosphorus is decreased 1 pound for each 5 to 18 pounds of P2O5 removed by the crop. Sandy soils decline more quickly than finer textured soils. A similar guide for potassium is that the soil test is decreased 1 pound for each 4 to 10 pounds of K2O removed. Again, sandy soils decline more quickly than finer textured soils.
Fertilizer recommendations are based in part on yield goals. See the section titled "Yield Potentials of Soil Management Groups" for more information.
Many factors influence the efficiency of fertilizer use including soil structure, growing conditions, and fertilizer placement. Fertilizers are most effective on well-drained soils with favorable structure that promotes deep rooting.
| Visual title - Visual size | Visual title - Visual size |
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| Nutrient removal by several Michigan field crops - 72K |
