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在温室盆栽条件下，研究了小麦和苕子在不同土壤（黑淤土、高砂土、白土）上的吸钾特性与钾肥肥效、作物根系参数变化间的关系。初步结果表明：小麦吸钾能力大于苕子，主要是前者利用土壤非交换性钾的能力较强。这两者根系的总活跃吸收表面积间的差异表现最为明显，并且与作物吸钾量、生物产量间呈显著正相关。此外，不同土壤上同种作物的根系生物产量、根系活力与作物吸钾量间也呈正相关。单位根重的阳离子交换量：苕子＞小麦，它受土壤供钾状况影响较小。不同供钾水平土壤上，钾肥肥效均以小麦优于苕子，钾肥利用率也以小麦较高。
Under greenhouse conditions, the relationship between potassium uptake characteristics and fertilizer efficiency and changes of root parameters in different soil (black silt soil, high sandy soil and clay soil) was studied. The preliminary results showed that: wheat potassium absorption capacity is greater than the prickly heat, mainly the former ability to use soil non-exchangeable potassium. The difference between the total active absorbing surface area of the two roots was the most obvious, and there was a significant positive correlation with the potassium uptake and biomass yield. In addition, root biomass, root activity and crop potassium uptake of the same crops on different soils also showed a positive correlation. Cation exchange capacity per unit weight of roots: Prickly heat plants> Wheat, which is less affected by soil potassium supply. Different levels of potassium on the soil, potassium fertilizer are better than wheat buckwheat, potassium utilization is also higher in wheat.