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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1Soil Test Categories.
SDSU Extension fertilizer recommendations are based on field research in South Dakota and neighboring states . However, information from outside this region is used where only limited local data was available . ... (0.5 – (0.034 x STP)) x YG = (0.85 – (0.0057 x STK)) x YG.
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