| In order to determine the impact of irrigation and potassium to yield and its factors for cotton,3 treatments of irrigation and 5 treatments of potassium levels were used.The test variety is Longmian No.1.The result showed that irrigation and potassium fertilization will affect the boll number of cotton,boll weight and lint percentage,and the yield of cotton as the ultimate result. Irrigation mainly affects boll number of cotton.With the increase in irrigation,cotton plants increase correspondingly in the number of bolls,but relatively extended period of fertility,thereby reducing the cotton flower before frost rate.Potassium fertilization mainly affects boll weight and lint percentage of cotton plant.Of all the treatments,the application of potash fertilizer and no potash fertilizer,the yield difference reached a very significant level.However,to play the best potash fertilizer efficiency,we must strictly control irrigation.In the conditions of K content in the soil was 140 mg/kg and normal application of N,P fertilizer,to irrigate water 3 000 m3/hm2,fertilize K2O 105.0 kg/hm2,can make the highest yield of cotton. |