不同水分调亏下冬小麦适宜灌水定额研究

Suitable Irrigation Water Quotas of Winter Wheat under Water Deficit Irrigation

通过测坑试验，对比研究了不同灌水控制下限和灌水定额下冬小麦的生长发育、耗水及产量形成的差异。结果表明，分蘖数倍增是拔节以前冬小麦幽，增加的主要动力：各轻旱和中旱处理间的总耗水量差值以及冬小麦苗期耗水量均随灌水定额增加而增大：冬小麦的茎粗和千粒质量受土壤水分及灌水定额影响均不大：各受旱处理的总耗水量和籽粒产量分别较适宜水分处理下降了约11．98％～35．32％和8．87％～31．12％。综合考虑籽粒产量和WUE，选择灌水定额105mm作为冬小麦受旱条件下的适宜灌水定额。

Through lysimeter experiments, the variation of two agronomy indexes, water consumption and grain yield of winter wheat under different irrigation water quotas and soil water deficits were analyzed. The results showed that the tiller number doubling was the main power to increase LAI continuously at the stage before elon- gation. The stem diameter and 1000-grain weight were varietal characters under different irrigation water quotas and water deficits, but the difference value of water consumption between light drought and medium drought, as well as water consumption at the seedling stage increased with the increase of irrigation water quota. The decreas- ing range of water consumption and grain yield were 11.98%-35.32% and 8.87%-31.12%, respectively. In order to achieve high yield and high WUE, it is proposed that 105 mm be selected as the suitable irrigation water quota for winter wheat under regulated deficit irrigation.