水肥因素对膜下滴灌棉花产量和棉株群体冠层结构的影响研究

摘要

以新陆早7号为试材，进行了不同水肥条件下膜下滴灌棉株群体冠层结构测定和产量结果分析。试验表明，合理水肥条件下的棉株群体叶面积指数(LAI)、叶倾角(MLA)和散射光透过率(TD)，在盛花盛铃期分别为3.55～3.95、40°～48°和18.5%～28.1%。在一定水肥范围内，滴灌棉花产量随灌水量和施肥量的增加而增加，但超过一定阈值产量有下降趋势。适宜水肥条件下产量最高。%Cotton canopy structure and yield was determined and analyzed in different water and fertilizer conditions under mulch drip irrigation (MDI) with Xinluzao No.7 as the test material. The results showed that LAI, MLA and TD of MDI cotton was 3.55～3.95, 40°～48° and 18.5%～28.1% respectively in blooming period by the supply of rational water and fertilizer quantities. Yield of MDI cotton increased in the scope of specific water and fertilizer. But yield dropped gradually when certain quantity of water and fertilizer arrived. High-yield was created in an appropriate supply of water and fertilizer.