A soil test for sulphur and interpretative criteria for Saskatchewan

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Abstract
An automated soil test for sulphur and interpretative criteria for Saskatchewan conditions are presented. Sulphate‐sulphur (SO4‐S) in 0.01 M CaCl2 extracts of soil is determined by turbidimetric and nephelometric procedures operating simultaneously in an AutoAnalyzer system. A procedure for the segregation and elimination of samples containing excessive amounts of SO4‐S is described. The total amounts of soluble SO4‐S in the 0–60 cm soil layer is considered for interpretative purposes. Tentative critical values for two broad groups of field crops and a preliminary summary of the sulphur status of Saskatchewan soils based on analysis of farm samples are discussed.

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