钾肥肥效和需钾程度,主要决定于土壤钾素供应水平;土壤供钾潜力与成土母质及其风化程度密切相关。本项研究主要对我省几种主要成土母质发育的红壤性水稻土,在不施钾的条件下,进行生物耗竭盆栽试验,以探明其钾素供应潜力和土壤钾的动态消长,为合理利用钾肥,改革施肥结构提供科学依据。 Potassium fertilizer efficiency and potassium demand, mainly determined by the level of soil potassium supply; potential for soil potassium and soil parent material is closely related to the degree of weathering. In this study, several main red soil paddy soils developed in China were studied. Bio-depletion pot experiments were conducted under the condition of no potassium applied to ascertain the potential of potassium supply and the dynamic growth and decline of potassium in soils Rational use of potassium fertilizer, fertilizer structure reform to provide a scientific basis.