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Fertilizer Recommendations Guide

FertilizerRecommendations GuideReview and Revision: Jason Clark | Assistant Professor & SDSU Extension soil Fertility SpecialistEC750 Original Authors: 2005 Jim Gerwing | Extension soil Specialist Ron Gelderman | soil Testing Program ManagerDepartment of Agronomy, Horticulture & Plant ScienceCollege of Agriculture, Food & Environmental SciencesContentsIntroduction ..1 soil Test Categories ..1 Nitrogen ..1 Deep nitrate test ..1 Legume credits ..1 Manure credits ..2 Nutrient Recommendation Equations used by used by SDSU Extension ..3 Phosphorus and Potassium ..4 Seed-Placed Fertilizer ..4 Nitrogen, Phosphorus, and Potassium Recommendation Tables and StatementsCorn ..5 Corn silage ..6 Sorghum ..7 Sunflower.

at the very low soil test level to less than a 20% chance when soil tests are in the very high range . The probability of a yield response to fertilizer in the medium soil test range is estimated at between 40 and 60% . Soil test categories are listed in Table 1 . Soil test categories for the nitrate-nitrogen test are

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