A laboratory procedure was sought which would determine available sulfur in soils. As finally evolved, the method consists of extracting the sulfur with 0.5 M NaHCO 3 at pH 8.5 and determining sulfur in the extract by the Johnson‐Nishita procedure. Sulfur determined in this manner correlated very well with sulfur “A” values, an “r” value of 0.89 being obtained for 30 surface soils. Soils having < 10 ppm. S as determined by the proposed procedure generally responded to applications of sulfur.
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Kilmer et al. (1960) studied this question.