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The Determination of Available Sulfur in Soils¹

ABSTRACT

A laboratory procedure was sought which would determine available sulfur in soils. As finally evolved, the method consists of extracting the sulfur with 0.5M NaHCO₃ 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.

¹ Contribution from the Soil and Water Conservation Research Division, ARS, USDA, Beltsville, Md. Presented before Div. II, Soil Science Society of America, Nov. 19, 1959, at Cincinnati, Ohio.

² Soil Scientists.

Received for publication October 26, 1959. Accepted for publication May 3, 1960.