Preliminary study on yield increasing effect of potassium application on winter wheat in arid fertilized soil of western henan province

Studies revealed that potassium application.increased potassium absorption of winter wheat,impulsed the growing of plant,raise the rated of heading,grain mumber per ear and the weight per 1000 grain,and reduced the percentage of sterilization.Meanwhile,the increase in yield was 10.6～25.8 percent . Experiment showed that yield model of potash fertilizer was y=4224.83+9.5420x 0.028x 2.From the solution of this model,maximum yield,amount of potash fertilizer applied,optimum application fertilizer and net interests of fertilizer applied got to 5 223.18 kg/h m 2,209.25 kg/hm 2,158.65 kg/hm 2 and 983. 97 yuan/hm 2 respectively.