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Soil Testing for Nutrients. 1. pH testing done using an electrode or colorimetrically2. Phosphorus analysis done colorimetricallyor analyzed using ICP (inductively coupled plasma emission)3. Potassium measured by flame photometer or ICP. Soil Test Ratings. 1. Below optimum (low): Nutrients need to be added to supply the needs of the plant and also to raise the soil test level into the optimum range.2. Optimum (medium): Nutrients need to be added to supply the needs of t22

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