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镧（１０μｍｏｌＬ－１）和钙（１ｍｍｏｌＬ－１均降低水稻根系对ｋ＋的亲和力，以致钾的吸收下降。前者属竞争性抑制；镧促进磷的吸收，使ｋｍ值减小，Ｖｍａｘ增大，而钙则抑制磷的吸收，属反竞争性类型。
Lanthanum (10μmolL-1) and calcium (1mmolL-1) all decreased the affinity of rice roots for k +, resulting in a decrease in potassium absorption. The former was a competitive inhibitor and lanthanum promoted the uptake of phosphorus, resulting in a decrease in km and an increase in Vmax Calcium is to inhibit the absorption of phosphorus, is an anti-competitive type.