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Published in Soil Sci Soc Am J 26:63-65 (1962)
© 1962 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Biological and Chemical Evaluation of the Readily Available Sulfur Status of Mississippi Soils1

J. O. Sanford and J. D. Lancaster2

ABSTRACT

A quick-cropping technique was adapted to study the immediately available S in soils. Forty Mississippi soils were cropped using this technique. Sulfur uptake by the crop was compared with the sulfate-S content of the soils. Correlation of the two variables proved highly significant (r = 0.87). Reduction in soluble sulfate content of soils during the short cropping period agreed rather closely with S absorbed by the crop.

A study of the distribution and availability of sulfate in the profile of soils of the Hill area of Mississippi showed that, in general, sulfate-S in the subsoil of a particular profile tended to exceed that in the corresponding surface soil. Sulfate-S in subsoils was almost as available as that in surface soils under the conditions of the experiment. Ratios of S uptake by plants to sulfate-S in soils were 1:1.5 for surface soils and 1:1.7 for subsoils.

NOTES

1 Contribution from the Soil and Water Conservation Research Division, ARS, USDA, and the Mississippi Agr. Exp. Sta. Published with the approval of the Director of the Mississippi Agr. Exp. Sta. as Journal Article 908.

2 Soil Scientist, USDA, and Agronomist, Mississippi Agr. Exp. Sta., State College. The authors wish to express their appreciation to W. J. Drapala, Statistician, Mississippi Agr. Exp. Sta. for assistance with certain statistical analyses relative to this study.

Received for publication March 29, 1961. Accepted for publication May 5, 1961.






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