Solubility relationships of iron manganese copper and zinc in alkaline and calcareous soils

Sinha, M.K.; Dhillon, S.K.; Dhillon, K.S.; Dyanand, S.

Australian Journal of Soil Research 16(1): 19-26


DOI: 10.1071/sr9780019
Accession: 006435580

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The solubility relationships of the native forms of Fe, Mn, Cu and Zn in alkaline and calcareous soils were determined by a modification of the chelate equilibrium method proposed by Norvell. The experimentally determined activity product (Fe3+)(OH-)3 in soils was found to vary within the reported range of solubility products of amorphous hydrous ferric oxides. Soils which undergo alternate cycles of reversible, oxidation-reduction processes were found to maintain higher solubility of Fe and Mn than other soils. Soil pH and organic matter content were found to significantly affect the solubilities of all the 4 micronutrient cations. The solubility relationships of Mn, Cu and Zn were expressed as a function of soil solution pH. Probable mechanisms controlling the solubility of these metals in alkaline and calcareous soils are discussed.