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Copper adsorption by soils and its relations with plant growth



Copper adsorption by soils and its relations with plant growth



Zeitschrift fuer Pflanzenernaehrung und Bodenkunde 144(6): 597-612



Cu adsorption studies were conducted with 13 neutral to calcareous-alkaline soils. The data followed a Langmuir isotherm with 2 linear parts at low (part 1) and high (part 2) concentration of Cu in equilibrium solution. The pCu + 2pOH values show that part 1 and 2 stem largely from adsorption and precipitation reactions of Cu, respectively. The bonding energy and differential buffering capacity were significantly higher for part 1 while adsorption maximum and supply parameter were significantly higher for part 2 of the isotherms. Carbonate content, soil pH, organic matter, CEC [cation exchange capacity] and clay content were in that order the predominant factors in elevating adsorption maximum, bonding energy coefficient and differential buffering capacity as well as decreasing supply parameter of soils. However, soil organic matter was the major determinant of strength of Cu adsorption. Cu potentials, adsorption maximum and differential buffering capacity were significantly correlated with dry matter production and Cu uptake in maize. The parameters of intensity factor predicted better the variation in yield and Cu uptake than the conventional soil test methods.

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Accession: 000848490

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DOI: 10.1002/jpln.19811440609


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