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:1 995— 1 998年度 ,在镇原试区进行的主要粮食作物集雨节灌试验结果表明 :不同年型地膜冬小麦、地膜玉米关键生育期集雨节灌均具有显著的产量效率 ,可明显提高水分利用效率。无论降水年份的异同 ,集雨补灌的最佳时期冬小麦为拔节期 ,玉米为大喇叭口期 ;干旱年低量 (1 2、2 4m m )集雨在最佳时期补灌 ,较其它时期补灌的供水效率冬小麦、玉米分别提高 1 .9— 6 .3、1— 3倍 ,且等量水分在玉米关键期供给较小麦供水效率高 3倍左右 ,体现低量集雨对不同作物及关键期补灌的高补偿效应
: 1 The results of rainwater harvesting experiments of major grain crops conducted in Zhenyuan pilot area in 1995-1998 show that rainwater harvesting with different annual types of plastic film mulching and winter mulching has significant yield efficiency at the key growth stages, Improve water use efficiency. Regardless of the similarities and differences in precipitation years, the best period of rainwater harvesting was winter wheat with jointing stage and maize with large bellmouth stage. Rainfall (122.4m m) Water supply efficiency of supplementary irrigation Winter wheat and maize increased by 1.9-3.3 times and 1-3 times respectively, and the same amount of water provided about three times higher water supply efficiency in the key period of corn, reflecting low rainfall on different crops and High compensation effect of key period irrigation