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Comparison of seven kinetic equations for K release and application of kinetic parameters.

作者：

LuXiaoNan;Xu JianMing;Ma WanZhu;Lu YunFu

单位：

;Institute of Soils and Fertilizers, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China.

关键词：

crop yield;dry matter;electric field;equations;kinetics;maize;mathematical models;nitrogen phosphorus fertilizers;npk fertilizers;nutrient content;potassium;potassium fertilizers;quaternary soils;red soils;soil types

摘要：

Maize field experiments were conducted in the hilly red soil region of Zhejiang Province, China, to evaluate the suitability of seven equations, which derived K release characteristics under two electric field strengths of 44.4 and 88.8 V/cm and to explore the practical application of the parameters of these equations. There were two treatments, NP and NPK, where N in the form of urea, P in the form of calcium phosphate, and K in the form of KCl, were applied at rates of 187.5, 33.3, and 125 kg ha-1, respectively, on soils derived from Quaternary red clay. Plant grains and stalks were collected for determination of K content. The seven equations were Simplified Elovich, parabolic diffusion, power function, exponential, second-order, first-order and zero-order. The second-order and Elovich equations excellently described K release; the first-order, power function, and parabolic diffusion equations also described K release well; but the zero-order and exponential equations were not so good at reflecting K release. Five reference standards from the field experiments, including relative grain yield (yield of the NP treatment/yield of the NPK treatment), relative dry matter yield (dry matter of the NP treatment/dry matter of the NPK treatment), quantity of K uptake in the NP treatment (no K application), soil exchangeable K, and soil HNO3-soluble K, were used to test the effectiveness of equation parameters obtained from the slope or intercept of these equations. Correlations of the ymax (the maximum desorbable quantity of K) in the second-order equation and the constant b in the first-order and Elovich equations to all five reference standards were highly significant (<=0.01). The constant a in the power function equation was highly significant (P<=0.01) for four of the five reference standards with the fifth being significant (P<=0.05). The constant b in the parabolic equation was also significantly correlated (P<=0.05) to the relative grain yield and soil HNO3-soluble K. These suggested that all of these parameters could be used to estimate the soil K supplying capacity and the crop response to K fertilizer..

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Comparison of seven kinetic equations for K release and application of kinetic parameters.

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