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Quality assurance plants for agricultural testing laboratories; Soil analysis methods; Determination of soil water pH; Determination of specific conductance in supernatant 1:2 Soil: Water solution; Determination of soil Buffer pH by the SMP Lime Buffer-Original and Double-Buffer adaptation; Determination of exchangeable acidity and lime requirement by the Mehlich Buffer-Ph method; Determination of Phosphorus by Bray Pl extraction; Determination of Phosphorus by Olsen's Sodium Bicarbonate extraction; Determination of Potassium, Magnesium, Calcium and Sodium by neutral normal Ammonium Acetate extraction ...