Pedosphere 5(4): 371--378, 1995
ISSN 1002-0160/CN 32-1315/P
©1995 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Kinetic equations of potassium desorption and the application of equation constants |
| LÜ Xiao-Nan and LU Yun-Fu |
| Institute of Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021 (China) |
| ABSTRACT |
| Elovich, parabolic diffusion, power function and exponential equations were used to describe K desorption kinetics of 12 soils in a constant electric field of electro-ultrafiltration (EUF). Results showed that the Elovich, parabolic diffusion and power function equations could describe K desorption kinetics well owing to their high correlation coefficients and low standard errors; but the exponential equation was not suitable to be used in this study due to its relatively low correlation coefficients and relatively high standard errors. This work established successfully the relationships between the constants (slope or intercept) of kinetic equations and the barley responses to K fertilizer in the multiple-site field experiments and K-supplying status of soils, the constants of Elovich, parabolic diffusion and power function equations were very significantly or significantly correlated to the soil available K, relative yield of barley and K uptake of barley in NP plot. It was suggested that the kinetic equation constants could be used to estimate K-supplying power of soils. |
| Key Words: barley, constant, electro-ultrafiltration (EUF), kinetic equation, K desorption |
| Citation: LÜ Xiao-Nan and Lu, Y. F. 1995. Kinetic equations of potassium desorption and the application of equation constants. Pedosphere. 5(4): 371-378. |
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