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International Journal of Soil Science
  Year: 2009 | Volume: 4 | Issue: 2 | Page No.: 27-45
DOI: 10.3923/ijss.2009.27.45
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Effects of Ammonium and Iranian Natural Zeolite on Potassium Adsorption and Desorption Kinetics in the Loess Soil

M. Rezaei and S.A.R. Movahedi Naeini

Information about the adsorption and desorption kinetics of potassium and the consequent alterations with zeolite additions are limited in Golestan Province loess soils with illite dominance in the clay fraction. The kinetics of potassium adsorption and desorption with different KCl concentrations (0, 40, 60, 80, 110 and 140 mg L-1) and KCl+NH4Cl concentrations (K80,N60; K80,N120; K60,N60; K110, N120; K80, N90 and K110, N90 mg L-1) on the soil, the zeolite and their incorporation (within 2 and 1800 h) were investigated with this research using batch method. Potassium adsorption and desorption was initially fast (first 48 h) but continued with low speed (after 48 h) until the end of the experiment. Results shown increasing of K+ concentration increased rate of adsorption and desorption in soil, zeolite and their incorporation and zeolite increased adsorption and decreased desorption rate by incorporation with soil. Ammonium presence decreased potassium adsorption and it increased potassium desorption. K/NH4 desorption rate did not follow exactly K/NH4 adsorption ratio for all treatments. The kinetic equations used to estimate data were zero order, first order, simple Elovich, parabolic diffusion and power function. The Elovich model described the adsorption and desorption processes on soil and soil with zeolit (0.88<R2<0.99). Elovich and power function models described adsorption and desorption processes, respectively for zeolite well (0.65<R2<0.97). The models indicated that K+ adsorption and desorption was diffusion controlled. Potassium adsorption and release by batch method did not simulate potassium uptake by wheat.
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How to cite this article:

M. Rezaei and S.A.R. Movahedi Naeini, 2009. Effects of Ammonium and Iranian Natural Zeolite on Potassium Adsorption and Desorption Kinetics in the Loess Soil. International Journal of Soil Science, 4: 27-45.

DOI: 10.3923/ijss.2009.27.45






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