膜下滴灌棉花水肥耦合效应及其模式研究

Study of Coupling Effects and Water-Fertilizer Model on Mulched-Cotton by Drip Irrigation

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 effect of water fertilizer coupling on cotton under film mulching and drip irrigation (MDI) was significant. LAI and TD in the concerted water and fertilizers during the blooming period increased with the increase of water and fertilizer quantities, and were 1.56～3.95 and 18.7%～35.7%, respectively in the rational W 225 and N 150 . It showed that the most important factor of controlling cotton yield under MDI was water. The higher water quantity increased the yield by 17.3%～34.4% than that of the higher fertilizer quantity by 4.4%～16.2%. The coupling effects of N 60 W 315 、N 150 W 225 and N 240 W 135 were very significant and the condition of the concerted water fertilizer couplings was obtained.