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Response of Crops to Sulfur on Southeastern Soils¹

ABSTRACT

A regional project was begun in 1953 to study sulfur supplies and requirements for crops in the Southeastern States. Typically the Red-Yellow Podzolic soils of this area contain 3 ppm. or less of extractable sulfur in the plow layer although there are accumulations of larger amounts in some deeper horizon. In the southern tier of states, rainfall contributes about 5.4 pounds of sulfur per acre annually. These amounts fail to meet the needs of high sulfur-requiring crops, and without substantial additions in fertilizers or otherwise the soils are potentially sulfur deficient. Responses to sulfur applications were obtained in 10 of 29 field experiments with cotton, clover, clovergrass combinations, and tobacco.

Cotton, clover, and tobacco absorb sulfur readily as increasing amounts are applied with fertilizer. A tentative threshold value for adequately nourished cotton is about 0.20% sulfur in leaves and petioles in mid-August. A corresponding value for clover is about 0.15%.

¹ Contribution from the Eastern Soil and Water Management Research Branch, A.R.S., U.S.D.A., in cooperation with the Mississippi Agr. Exp. Sta. Presented before Div. IV, Soil Science Society of America, Atlanta, Ga. Nov. 21, 1957.

² Soil Scientists.

Received for publication January 10, 1958. Accepted for publication February 10, 1958.