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Greenhouse Measurement of Available Sulfur Using Radioactive sulfur¹

ABSTRACT

Available sulfur was determined in a greenhouse experiment with 30 surface soils from the Southeastern United States by growing cotton plants at six levels of applied sulfate-sulfur, 0, 2, 4, 8, 16, and 32 ppm. The A value technique involving radiosulfur was used as an index of available sulfur.

Sulfur A values varied from 9.8 ppm. to 42 ppm. A high degree of correlation was obtained between A values and the percent sulfur in the control plants. Growth responses from applied sulfate-sulfur were also related to percent sulfur in the control plants and to A value sulfur in the soil. The total uptake of sulfur also was related closely to the total available sulfur in the soil (A value plus fertilizer sulfur). A sixteen-fold increase in the rate of sulfur addition increased the A value by approximately 20%.

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 September 23, 1960. Accepted for publication November 29, 1960.