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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 N1 50 kg· hm- 2 处理较为合理 ,相应值为 1 .56～ 3.95和 1 8.7%～ 35.7% ;水分是限制滴灌棉花产量的主导因素 ,施肥次之 ,较高水分下的增产幅度为 1 7.3%～ 34.4% ,而较高施肥增幅为 4.4%～ 1 6.2 % ;N6 0 W315、N150 W2 2 5和N2 4 0 W135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 coupling effect of water and fertilizer on cotton under drip irrigation was obvious. Leaf area index (LAI) and scattering light transmittance (TD) within a certain water and fertilizer range increased with the increase of irrigation and fertilizer application during the flowering and boll irrigation periods. The irrigation water was 225 mm and the application rate was N1 50 kg · hm- 2 treatment is more reasonable, the corresponding values of 1.56 ~ 3.95 and 1 8.7% ~ 35.7%; water is the dominant factor limiting the yield of cotton drip irrigation, fertilization followed, the higher the yield of 1 7.3% to 34.4% While the increase of fertilization was 4.4% ~ 1 6.2%. The interaction of water and fertilizer of N6 0 W315, N150 W2 2 5 and N2 4 0 W135 was significant, and the ratio of water and fertilizer was in a good state.