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一、研究的任务和要求河套灌区近年来每年播种小麦250万亩左右,根据本灌区气候及小麦生产季节用水特性,每年5月初到6月初(5月6日～6月4日)这一个月内为夏灌用水时期。该时期当地降雨量少,蒸发量大,小麦生长正处于分蘖,拔节阶段,恰是影响小麦增产的关键时期,灌溉水源是靠引黄河水,而5、6月份黄河尚处于枯水季节,上游宁夏地区也正处
I. Research Tasks and Requirements In recent years, Hetao Irrigation District has sown about 2.5 million hectares of wheat each year. According to the climate of the irrigation area and the seasonal water use characteristics of wheat production, a month from early May to early June (May 6 to June 4) Within the summer irrigation water period. During this period, there was little rainfall and large amount of evaporation. Wheat growth was at the tillering and jointing stages, which was the key period that affected the wheat yield increase. The irrigation water was relied on the Yellow River, while the Yellow River in May and June was still in the dry season, Ningxia region is also at