我国的灌溉面积,从解放初的2.4亿亩发展到现在的7亿亩,其中相当大的部分是在北方地区发展的。从五十年代开始,北方主要是修建水库或者自流引水发展灌溉,这是第一次进展,在此期间,大约发展灌溉面积1.5～1.6亿亩。到了六十年代后期,由于持续干旱,地 The irrigation area in our country has grown from 240 million mu in the early days of liberation to 700 million mu now, a considerable part of which has been developed in the northern region. Since the 1950s, the northern part has mainly been the construction of reservoirs or inflow irrigation to develop irrigation. This is the first progress. During this period, an estimated 1.5-1.6 billion hectares of irrigated land will be developed. By the late 1960s, due to continued drought, the land