Fertilizer Recommendations Guide

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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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1Nitrogen.

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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