Zinc sorption in selected soils

The adsorption of nutrient elements is one of the most important solid- and liquid-phase interactions determining the retention and release of applied plant nutrients and the efficiency of fertilization. The study showed that the soils with high cation exchange capacity (CEC), CaCO3, organic matter...

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Published in:Communications in soil science and plant analysis 2006-06, Vol.37 (11-12), p.1675-1688
Main Authors: Imtiaz, M, Alloway, B.J, Aslam, M, Memon, M.Y, Khan, P, Siddiqui, S.U.H, Shah, S.K.H
Format: Article
Language:English
Subjects:
acid soils
Acidic soils
adsorption
Agronomy. Soil science and plant productions
alkaline soils
Biological and medical sciences
bonding energy constant
calcium carbonate
cation exchange capacity
Fundamental and applied biological sciences. Psychology
isotherms
mathematical models
nutrient availability
soil fertility
soil organic matter
soil pH
soil texture
sorption
zinc
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Summary:The adsorption of nutrient elements is one of the most important solid- and liquid-phase interactions determining the retention and release of applied plant nutrients and the efficiency of fertilization. The study showed that the soils with high cation exchange capacity (CEC), CaCO3, organic matter contents, and heavy texture adsorbed more zinc (Zn). The alkaline soils from Pakistan adsorbed more Zn than English acidic soils. Langmuir and Freundlich isotherm fit was excellent, and r2 values for the Langmuir isotherm were highly significant (r2 = 0.84 to 0.99). The Langmuir b values, representing the adsorptive capacity of a soil, increased as the texture fineness increased in the soil, with increases in the concentration of adsorptive material (such as organic matter and CaCO3) and with increases in CEC and pH. The alkaline soils from Pakistan had higher bonding energy constant and higher log Kf values than the acidic English soils. Sequential extraction of Zn in these soils showed that most of the Zn was held in CaCO3 pool in the alkaline soils, whereas in acidic soils adsorbed Zn was in exchangeable form.
ISSN:0010-3624
1532-2416
DOI:10.1080/00103620600710330