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Field application of industrial by-products as Al toxicity amendments: chemical and mineralogical implications

AutorIllera Muñoz, Virginia; Garrido, Fernando ; Vizcayno, Carmen; García-González, M.T.
Palabras claveLime
Fecha de publicación24-feb-2004
EditorBritish Society of Soil Science
CitaciónBritish Society of Soil Science 55: 681-692 (2004)
ResumenLime, gypsum andvarious gypsum-like by-products have long been appliedto soil surfaces as ameliorants of soil acidity andaluminium andmanganese toxicity. We examinedchanges in chemical and mineralogical properties at two different depths in two acid soils one year after the application of gypsum, phosphogypsumþdolomitic residue, red gypsumþdolomitic residue, sugar foam, and sugar foamþminedgypsum. All treatments were foundto increase the proportion of Ca2þ andd ecrease those of Al3þ andMn 2þ in the exchange complex of the surface andsubsurface horizons, thus reducing its effective Al andMn saturation. However, the minedgypsum treatment resultedin losses of Mg2þ from the Ap horizon of the soils, andthe sugar foam treatment was not so effective with the AB horizons as the other treatments. The combined application of both gypsum-like by-products and the dolomitic residue proved the most effective choice with a view to reducing the effective Al and Mn saturation of the exchange complex in the Ap and AB horizons. In addition, both treatments reduced Mg2þ losses at both depths. Finally, all treatments resultedin the formation andretention on mineral andorganic surfaces of a large fraction of the Al3þ releasedby exchange with Ca2þ as Al polymers. This is quite consistent with the observedchanges in the CuCl2-, oxalate- andDTPA-extractable Al contents as well as by SEM and EDS analyses. Basedon these results, the use of the appropriate mixtures of these by-products is an effective alternative to that of mined gypsum and lime to alleviate soil acidity and reduce toxic concentrations of Al3þ andMn 2þ in agricultural acidsoils.
Descripción12 pages, figures, and tables statistics.
Versión del editorhttp://dx.doi.org/j.1365-2389.2004.00640.x
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