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Copper Adsorption by Soils and its Relations with Plant Growth
Author(s) -
Raikhy N. P.,
Takkar P. N.
Publication year - 1981
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19811440609
Subject(s) - adsorption , calcareous , organic matter , soil water , copper , chemistry , langmuir adsorption model , precipitation , inorganic chemistry , environmental chemistry , soil science , environmental science , geology , organic chemistry , paleontology , physics , meteorology
Copper adsorption studies were conducted with 13 neutral to calcareous‐alkaline soils. The data followed a Langmuir isotherm with two 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 and clay content were in that oder 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. Copper 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.