套播夏玉米全程免耕对水分利用效率的影响

节水耕作措施在旱作农田中研究的相对较多 ,而在灌溉农田上则较少研究。本文重点探索在灌溉农田上 ,节水耕作措施 (免耕 )与高效节水管灌技术相结合 ,充分发挥耕作措施与灌溉技术的节水潜力和优势 ,提高农田水分利用效率。试验结果表明 :同常规耕作相比 ,玉米全程免耕下棵间蒸发的无效耗水可降低 2 7.6% ;农田水分利用效率提高幅度达 18.9% ;同时 ,免耕措施具有明显的省工和节能效果 ,耕作成本可降低 52 .9%～ 74.3%。

Effects of No-tillage on Water Use Efficiency in Interplanted Summer Corn

Water saving tillage measures were studied and applied mainly in rainfed farmland. A study was carried out to study the suitable combination of water saving tillage measures(no tillage) with pipe irrigation techniques in irrigated farmland to give full play of the water saving potential and superiority of tillage measures and irrigation water techniques, as well as to improve farmland water use efficiency. Experimental results show that no tillage in summer corn can reduce soil surface evaporation by 27.6% and raise water use efficiency by 18.9%, compared with conventional tillage. Meanwhile, the on tillage measures have an obvious advantage of saving labors and energy and can lower tillage cost by 52.9%～74.3%.