膜下滴灌棉花水肥耦合效应明显 ,一定水肥范围内的叶面积指数 (LAI)、散射光透过率 (TD)在花铃期随灌水和施肥量的增加而增大 ,并以灌水 2 2 5mm ,施纯N 15 0kg/hm2处理较为合理 ,相应值为 1.5 6～ 3 .95和 2 3 .4%～ 35 .7% ;水分是限制滴灌棉花产量的主导因素 ,施肥之 ,较高水分下的增产幅度为 8.2 %～ 36 .4% ,而较高施肥增幅为 4.6 %～2 6 .1% ;N60 W315,N150 W2 2 5和N2 4 0 W13 5的水肥交互作用显著 ,水肥配比处于一种较为良好的状态 The effect of coupling water and fertilizer on cotton under drip irrigation was obvious. Leaf area index (LAI) and scattering light transmittance (TD) within certain water and fertilizer range increased with the increase of irrigation and fertilizer application in the flowering and boll irrigation periods. , Shi Chun N 15 0kg / hm2 treatment is more reasonable, the corresponding value of 1.56 ~ 3.95 and 23.4% ~ 35.7%; water is the dominant factor limiting the yield of cotton drip irrigation, fertilization, higher moisture , And the rate of higher fertilization was 4.6% -26.1%. The interaction of water and fertilizer of N60 W315, N150 W2 25 and N2 40 W13 5 was significant, and the ratio of water and fertilizer was A better condition