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Effect of Sulfur Applied and Date of Harvest on Yield, Sulfate Sulfur Concentration, and Total Sulfur Uptake of Five Annual Grassland Species¹

Synopsis: There were differences in yield, SO₄-S concentration, and total S uptake among competing species growing at different levels of available S. Yield response to S increased as the season advanced, but the concentration of total S and SO₄-S in the plants decreased. The SO₄-S concentration in each of the species where no S was applied was indicative of S deficiency. The SO₄-S concentration in subclover at flowering appeared to be the best single indicator of S status.

² Assistant Agronomist, University of California, Hopland Field Station, Hopland, California.

Received for publication September 17, 1962.

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