Extractable Sulfate‐Sulfur in Soils of Florida in Relation to Amount of Clay in the Profile

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Abstract
Sulfate‐S was extracted from the profiles of a number of uncropped soils, using samples obtained in soil surveys. The extractant used was sodium acetate adjusted to pH 4.8 with acetic acid.Little or no sulfate‐S was found in the surface horizons of the soils studied but considerable amounts were present in many of the subsurface layers. These deposits of sulfate‐S were found generally where clay was present in the profile. The amounts of sulfate‐S increase with increase in clay in a highly significant manner and generally at a much greater rate of increase. There appears to be some relation between amounts of sulfate and types of clay.Rainfall on these soils adds about 5 pounds of S annually per acre and much of this sulfate probably leaches down through the sandy surface layers that characterize many of the soils of Florida.

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