在江苏稻麦轮作一年两熟制地区的淋溶土和新成土上 ,连续两年进行钾肥运筹田间试验。结果表明 :钾肥无论在稻季或麦季施用 ,均有较好的增产效果 ,小麦的增产幅度大于水稻 ;钾肥的残留效应较大 ,可与当季增产效果类比 ,残效氮和残效钾之间有明显的交互作用 ;在稻麦轮作制中 ,钾肥麦季施用稻季不施用的运筹方式 ,钾肥的当季肥效、后季残效、年总产、钾素生产力及产 /投值均高于钾肥稻季施用麦季不施用的运筹方式。指出以水稻为主的稻麦两熟地区 ,评价钾肥效益应以轮作周期为基础。 On the leaching soil and newly formed soil of Jiangsu Province, where rice and wheat are in one crop and two ripening areas for one year, field experiments of potash fertilizer operation were conducted for two consecutive years. The results showed that potash fertilizer had better yield increase effect both in rice season and wheat season, wheat yield increased more than rice, the residual effect of potassium fertilizer was larger, which could be compared with the yield increase in the season, There was a significant interaction. In the rice and wheat rotation system, the potassium-irrigating and wheat-irrigating methods were not applied in paddy rice season, and the seasonal fertilizer efficiency, post-season residual effect, annual total yield, potassium productivity and production / Potash fertilizer season wheat season without application of the operation. It is pointed out that rice-wheat double cropping areas mainly based on rice should be evaluated on the basis of rotation cycle.