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Evidence of modern accumulations of adsorbed sulfate in an east tennessee usa forested ultisol

, : Evidence of modern accumulations of adsorbed sulfate in an east tennessee usa forested ultisol. Soil Science 132(6): 422-426

Previous studies on sulfate content and adsorption in a forested Ultisol showed that, although considerable amounts of adsorbed, insoluble sulfate were present in B horizon samples, further accumulations into this form could not be induced with additional inputs. Studies were conducted to determine what proportion, if any, of current adsorbed, insoluble sulfate is the result of modern inputs; and to examine whether these soils capable of further accumulation of adsorbed, insoluble sulfate under field conditions. Field studies, including sampling beneath and adjacent to an old house, a lysimeter investigation, and sulfate salt application, showed that sulfate has accumulated over the last 80 yr, is now accumulating, and can continue to accumulate at higher input levels in this soil. The discrepancies between laboratory and field results pose problems for easy estimation of sulfate adsorption capacity.

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