土壤钾解吸的动力学方程和大麦反应的关系

RELATIONSHIP BETWEEN POTASSIUM DESORPTION KINETIC EQUATIONS AND BARLEY RESPONSE

本文应用Ｅｌｏｖｉｃｈ、抛物线扩散、权函数和指数方程研究电超滤恒电场下１２种土壤钾解吸的动力学。Ｅｌｏｖｉｃｈ、抛物线扩散和权函数方程具有高的相关系数和小的标准差，可以很好地描述土壤钾解吸的动力学，而指数方程的相关系数低和标准差大而不适宜应用。本文成功地建立了动力学方程与大麦多点田间试验钾肥反应和土壤钾素状况之间的相关关系，Ｅｌｏｖｉｃｈ、抛物线扩散和权函数方程的常数（斜率或截距）与土壤速效钾、大麦相对产量（×１００％）和无钾处理（ＮＰ）大麦吸钾量之间呈极显著或显著相关，方程的常数可以用来评价土壤的供钾能力。

Elovich, parabolic diffusion,power function and exponential equations were usedto desoribe K desorption kinetics of 12 soils in a constant electric field of EUF.Results showed that the Elovich, parabolic diffusion and power function equationcould desoribe K desorption kinetics well,owing to the high correlation coefficientsand low standard errors;but the exponential was not suitable to be used in thisexperiment,due to the relatively low correlation coefficients and relatively high stan-dard errors.This paper established successfully the relationships between the kineticequations and the barley responses to K fertilizer in the field experiments and Kstatus of soils,the contants(slope or intercept) of Elovich,parabolic diffusion andpower function equations were highly significantly or significantly correlated to thesoil exchangeable K,relative yeild of barley (×100%)and K uptake by barley inthe NP plot.It was suggested that the kinetic equation constants could be used toevaluate K-su pplying power of soil.