Ecology, Environment and Conservation Paper

Vol.05, Issue 03, 1999; Page No.(235-241)

CHARGE SPECIATION OF MICRONUTRIENT CATIONS IN SOIL SOLUTIONS AS AFFECTED BY PH NEUTRALIZATION

P.C. Srivastava, D. Ghosh, A.K. AgnihcAri and A. Dobermann

Abstract

Different charge species of micronutrient cation (Zn, Cu, Fe, Mn) and soluble organic C in soil solution were characterized by ion exchange method in two acid, one neutral and one alkaline soils. Most dominant charge species in acid and neutral soils were amphoteric for Zn and Cu, cationic for Mn and neutral for Fe. In alkali soil, dominant charge species were cationic for Zn, amphoteric for Cu and Mn and neutral for Fe. Soluble organic C was present mainly as anionic species in all soils except neutral soil. Neutralization in acid or alkali soil changed the contents of different charge species of micronutrient cations and soluble organic C. Neutral species of Fe in acid soils and Zn and Mn in alkali soil increased which might explain the mobilization behaviour of these nutrients in amended soils and also under conditions of long term submergence.

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