Effects of different K sources and rates on grain yield, quality and nutrient absorption of wheat

An experiment was conducted in Huaxian,He'nan Province to compare the effects of different kinds of potassium fertilizers and their application rate on winter wheat under six potassium levels(0,45,90,135,180 and 225 kg/hm2).The results showed: potassium application could increase the yield,1000-grain weight, the number of grains per ear,amino acid.the content of protein,but the untilization efficiency of potassium always went down after reaching some amount of potassium application.At the same rate of K application,the effect of Lop Nur KS2O4 was better or almost the same as other kinds of potassium.When the amount of K application was 135 kg/hm2,these indexs were the biggest,including the grain yield,total yield,the content of nutrient in seed,amino acid and the profit.When the amount of K application was 180 kg/hm2,the content of protein in seed was the biggest.Through the equatation,it showed that when the amount of K application was 121.4 kg/hm2,the value of output was 10 227.4 Yuan/hm2 and the profit was 8 392.0 Yuan/hm2.