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塿土各粒级Ｋ十吸附特征有很大区别。在一定平衡液浓度下，颗粒越细，土壤固相吸附量越大，不同粒级固相吸附量大小顺序是：（＜０．１μｍ）＞（＜１μｍ）＞（１－２μｍ）＞（２－５μｍ），不同粒级土壤有效阳离子交换量也具有相同的变化规律。混合样中不同粒级组分对吸附的贡献可用吸附贡献率表示，■土各粒级饱和吸附贡献率大小顺序为：（＜１μｍ）＞（１－２μｍ）＞（＞５μｍ）＞（２－５μｍ），其中粘粒部分的饱和吸附贡献率为８５％左右。在供试混合土样中＜１μｍ粒级吸附贡献率随平衡液浓度增大呈幂函数形式增大，相反，１～２μｍ、２－５μｍ粒级吸附贡献率随平衡液浓度增大则呈幂函数形式减小。实验证明混合样中不同粒级Ｋ＋吸附存在交互作用，吸附交互作用大小可用吸附交互作用系数表征，＜１μｍ和１－２μｍ之间存在吸附负交互作用，且随平衡液浓度增大而增强。＜１μｍ和２－５μｍ之间存在吸附正交互作用，且随平衡液浓度增大而减弱。论述了建立土壤多粒级组分吸附方程的必要性，提出了多粒级组分吸附方程：
Soil K particle size K 10 adsorption characteristics are very different. At a certain equilibrium solution concentration, the finer the particles, the greater the amount of solid-phase adsorption on the soil. The order of the sizes of solid particles adsorbed by different fractions is: (<0.1μm)> (<1μm)> (1-2μm)> -5μm), the effective cation exchange capacity of different soil fractions also had the same variation rule. The contribution of different fractions in the mixed samples to the adsorption can be expressed as the contribution rate of adsorption. ■ The order of the contribution rates of the saturated adsorption for each fraction is: (<1μm)> (1-2μm)> (> 5μm)> (2- 5μm). The saturated adsorption contribution of clay fraction is about 85%. In the mixed soil samples, the contribution of <1μm particle size adsorption increased with the increase of equilibrium solution in the form of power function. Conversely, the adsorption contribution of particle sizes 1-2μm, 2-5μm increased with the increase of equilibrium solution The function is reduced in form. Experiments show that there is interaction between different particle size K + adsorption in the mixed sample. The size of the adsorption interaction can be characterized by the interaction coefficient of adsorption. There is a negative negative interaction between 1μm and 1-2μm, and increases with increasing concentration of the equilibrium solution. There is an adsorption orthogonal interaction between <1μm and 2-5μm, and weakened with increasing concentration of equilibrium solution. The necessity of establishing the adsorption equation of soil multi-fraction components is discussed. The adsorption equation of multi-fraction components is proposed.