Available-Sulfur Status of Some Representative Iowa Soils, May 1974

(1974) Available-Sulfur Status of Some Representative Iowa Soils, May 1974. Iowa State University

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Abstract

This study was undertaken to obtain basic information on the available-S status of some representative soils as a preliminary step in evaluating the S requirements of crops on Iowa soils (56). The main objectives of the study were to evaluate plant availability of S in some representative soil samples, to measure by laboratory techniques the amounts of various forms of S present in these soil samples, and to determine which of these measurements provides the best index of S availability to plants. Other objectives were to examine the distribution of available S with depth and time in some soil profiles, to assess the availability to ryegrass of applied sulfate, and to assess the effect of drying soil samples on S availability.