HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by McClung, A. C. Articles by Lott, W. L. Search for Related Content PubMed Articles by McClung, A. C. Articles by Lott, W. L. Agricola Articles by McClung, A. C. Articles by Lott, W. L.

Analyses of Several Brazilian Soils in Relation to Plant Responses to Sulfur¹

ABSTRACT

Greenhouse studies indicated many soils of the central plateau of Brazil to have a poor S supply. The most acute deficiency was found on soil from an upland savanna, but surface soils (0 to 20 cm. A₀ excluded) from virgin forests also responded. The B horizon of cultivated soils responded less frequently than that of the virgin soils, suggesting some downward movement of S under cropping. Such movement was also indicated by higher levels of NH₄OAc-extractable S. Sulfur extracted in this way correlated well with growth responses of millet grown in pot culture. In most soils, the addition of 20 pounds S as CaSO₄ per 2 million pounds of soil resulted in maximum dry matter production under the intensive cropping existing in these experiments. It is postulated that responses to S in this region will not be common unless N and P levels are improved. If these elements are plentifully supplied, however, and cropping is intensive, S deficiencies may occur on many soils.

¹ Contribution from the the IBEC Research Institute, Matão—EFA, Estado de São Paulo, Brazil. The authors are indebted to Armando Conagin for statistical analyses. Presented before Div. IV, Soil Science Society of America, Aug. 7, 1958, at Lafayette, Ind.

² Soil Scientist, Associate Soil Scientist, and Chemist, respectively, IBEC Research Inst.

Received for publication August 11, 1958. Accepted for publication October 23, 1958.