Pedosphere 3(4): 371--376, 1993
ISSN 1002-0160/CN 32-1315/P
©1993 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Comparative Study on the Kinetic Equations of Potassium Release from Soils
Institute of Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021
      Elovicb, two-constant, parabolic diffusion, exponential, second-order, first-order and zero-order equations were used to describe the kinetic characteristics of potassium desorption from six paddy soils df Zhejiang Province in a constant electric field (44.4 V/ cm) of EUF. Results showed that the second-order and Elovich equations could describe the potassium desorption kinetics best, as evidenced by the highest correlation coefficients (r) and the lowest standard errors (SE). The first-order, two-constant and parabolic diffusion equations also described the K desorption kinetics well, as showed by the relatively high correlation coefficients and relatively low standard errors. The zero-order equation did not describe the K desorption satisfactorily with a relatively low correlation coefficient and relatively high standard error. However, the exponential equation could not be used to describe the K desorption kinetics, due to the lowest correlation coefficient and the highest standard error.
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Citation: Lu, X. N. and Lu, Y. F. 1993. Comparative Study on the Kinetic Equations of Potassium Release from Soils. Pedosphere. 3(4): 371-376.
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