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宁夏引黄灌区春旱、多风、少雨、蒸发量大、土壤失墒快,加之当地头水灌的较迟,不能满足当时小麦生长发育对水分的需要,对产量有一定影响。因此,研究及时早灌头水的作用十分必要。产量结果根据试验,4月21日早灌头水的亩产739.5斤,比5月4日晚灌头水的增产9.6％。据三种不同头水期的对比,4月下旬灌头水的,都比5月上旬灌头水的明显增产。与晚期灌(5月4日)相比,早期灌(4月21日)的增产6.8％,中期灌(4月27—
In the Yellow River irrigation area of Ningxia, the spring drought, windy, dry, evaporation, soil loss of soil moisture fast, coupled with the local irrigation of the water later, can not meet the needs of wheat growth and development of water, have a certain impact on the yield. Therefore, it is necessary to study the effect of early irrigation of head water. Yield According to the test, on April 21, 739.5 kg per mu of early irrigation was produced, 9.6% more than that of the first run on May 4. According to the comparison of the three different head-water periods, the head-end water in late April is obviously more yielding than the head-end water in early May. Compared with the late irrigation (May 4), the early irrigation (April 21) increased 6.8%, the middle irrigation (April 27-