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Sulfate-Sulfur Concentration as an Indicator of Sulfur Status in Various California Dryland Pasture Species¹

ABSTRACT

Sulfate-sulfur values in subclover and soft chess under high N fertilizer were approximately equal over a wide range of S fertilizer levels. With no fertilizer N the SO₄-S values of annual grasses including soft chess were higher than those of rose or subclover. Hardinggrass was particularly high in SO₄-S. Where no N was applied the SO₄-S concentration in subclover decreased as the plants advanced from early vegetative to flowering stage. When plants began to wilt at the end of the season, the SO₄-S values increased over SO₄-S levels at flowering. Subclover and rose clover, sampled during the flowering period but before wilting, appeared to be the best plants for determining the S status of dryland pastures in California.

¹ Contribution of the Agronomy Dept., Univ. of California. Presented at Division S-4, Soil Sci. Soc. Am. Nov. 21, 1963, Denver, Colorado.

² Assistant Agronomist, Univ. of California, Hopland Field Sta., Hopland.

³ Extension Soils Specialist, Univ. of California, Davis.

Received for publication September 19, 1963. Accepted for publication January 6, 1964.