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Sulfur Availability in Seven Southeastern Soils as Measured by Growth and Composition of White Clover¹

Sypnosis: White clover, grown without added sulfur, was reduced in yield on 3 Southeastern soils at the third cutting and on all 7 soils at the fifth cutting. A seventh cutting produced extremely sulfur-deficient clover which was lower in nitrogen content and had a wider S:N ratio than clover which received sulfur. Methionine and cystine were decreased in dry matter. The nutritive value of the protein in the sulfur-deficient clover was maintained in terms of methionine but cystine was reduced.

² Soil Scientists, Eastern Soil and Water Management Section, Soil and Water Conservation Research Branch, A.R.S., U.S.D.A., in cooperation with the Miss. Agr. Exp. Sta. The authors are grateful to Dr. Lois Almon, Associate Home Economist, Miss. Exp. Sta., in whose laboratory these assays for methionine and cystine were made.

Received for publication December 16, 1956.