【摘要】 本文针对旱地作物长期受水分亏缺制约的问题，为了使有限降水资源得以高效利用，研究了几种作物需水关键期有限补充供水以及覆盖保水的效应，表明旱地有限供水的高效性和对提高经济效益的显著作用。提出了实现有限降水资源富集叠加高效利用建设旱区高产高效农田的技术途径。更多还原

【Abstract】 The paper aims at the problems of longterm water shortage and deficit to crop production in dryland region. The yield response to limited water supply at the key stages for water requirement of several crops and water-conserving mulches was experimented for full use of limited rainfall resource with high efficiency. The results indicated that the limited water supply has a very high efficiency and plays an important role in raising economic yields. The technical pathway for limited rainfall resource enrichment,piling up and high efficiency use to construct farmland with high yield and efficiency in dryland region is presented.更多还原