Effects of Different Potassium Fertilizer Application Rates on Yield,Plant K Accumulation of Summer Maize and K-efficiency in Alluvial Soil

Field plot experiment was used to study the effect of potassium fertilizer application on the yield,the plant K accumulation of summer maize and K-efficiency in the alluvial soil in Henan province,the result showed that:adequate potassium fertilizer increased evidently the yield of summer maize,the increases rate was 4.68 %-14.35 %;the plant K accumulation was enhanced with the increase of potassium fertilizer rate,and increased endlessly from Jointing stage to Filling stage.The K plant efficiency,K utilizing plant efficiency,Potassium fertilizer efficiency and Potassium fertilizer recovery rate showed descendant trend with the increase of Potassium fertilizer rate.Take considering of the higher yield,profit and fertilizer recovery rate as a whole,the treatment with 150 kg·hm-2 of K2O application was optimal with total increment of 1080 kg·hm-2of yield and 949 yuan·hm-2 of profit increment,with value cost ratio of 2.76 and 7.06 kg yield per kg K2O,potassium fertilizer recovery rate of 37.26 %.