Effects of Water and Nitrogen Coupling on the Yield of Different Varieties Cotton under Film Drip Irrigation

The field experiment was conducted to research the effects and differences of different quantity of water and nitrogen application on cotton yield in two cotton varieties.The results show that the yields of two cotton varieties were increased significantly with the increase of water and nitrogen,but reduced with excessive irrigation water,the maximum cotton yield were obtained with treatment N2W2(N2:360kg/hm2;W2:4500 m3/hm2).The cotton yield of Biaoza A1 is significantly higher than that of Xinluzao33,there was no significant difference between in treatment N1W1 and N1W3,other treatments showed ignificant difference in cotton yield between the two varieties.These results suggested that the yield and water and fertilizer use efficiency can be enhanced evidently by adopting suitable measures of water and fertilize application based on different cotton varieties.