Effects of Different Potassium Fertilizer Application Rates on Yield,K-efficiency of Winter Wheat and Soil Available K Balance in Sandy Chao Soil

Field plot experiment was used to study the effect of potassium fertilizer application on the yield,quality of winter wheat and soil K balance in the sandy Chao soil in Henan Province.The results showed that potassium fertilizer increased evidently the yield of winter wheat,the increases rate was 7.9%-27.7%.The plant K accumulation enhanced with the increase of potassium fertilizer rate,and it was larger 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.But the K utilizing efficiency and K harvest index showed ascendant firstly then descendant trend,the K 2 treatment was optimal.To keep the soil available K balance,the potassium fertilizer rate should be above 150 kg hm-2 at least.Take considering of the higher yield,profit,fertilizer recovery rate and soil K balance as a whole,the treatment with 150 kg hm-2 of K 2 O application was optimal with total increment of 1462.2 kg hm-2 of yield and 1069 yuan hm-2 of profit increment,and with 8.25 kg yield per kg K 2 O,with potassium fertilizer recovery rate of 41.6%,and with the soil available K balance.