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Nitrogen and potassium are important nutrientelements for rice.Besides supplied by the or- ganic manure,potassium nutrition of ricecomes dominantly from purple soils in Sichuanbasin.Potassium exists abundantly in mineralforms in the purple soils.Availability of soilpotassium for crop depends on the potassiumforms,the uptake ability of crops,and fertiliz-er practices.A pot culture experiment wasconducted to study the kinetics of potassiumuptake in the purple soil(total N 22.64g·kg~(-1),total K 24.36g·kg~(-1),available N 102.6mg·kg~(-1),available K 140.6mg·kg~(-1),acidsoluble K 936.0mg·kg~(-1),and pH 6.8).Ma-terials used were three F_1 hybrid rices,Eryou
Nitrogen and potassium are important nutrientelements for rice.Besides supplied by the organic manure, potassium nutrition of ricecomes dominantly from purple soils in Sichuanbasin .Potassium exists abundantly in mineralforms in the purple soils. Availability of soilpotassium for crop depends on the potassium forms, the uptake ability of crops, and fertiliz-er practices. A pot culture experiment wasconducted to study the kinetics of potassium uptake in the purple soil (total N 22.64 g · kg -1, total K 24.36 g · kg -1) , available N 102.6 mg · kg -1, available K 140.6 mg · kg -1, acidsoluble K 936.0 mg · kg -1, and pH 6.8) .Ma-terials were used in three F_1 hybrid rices, Eryou