Abstract
AbstractGreenhouse 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.
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