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20世纪70年代初期,宁南华弹乡修建丁一座中型蓄水工程——七○水库(库容1368万立方米)。它灌溉着全乡80％以上的耕地。华弹乡在水库发挥效益前,如1975年,粮食亩产仅72公斤,总产138万公斤,人均收入41元,经营单一。水库发挥效益后,至1989年,粮食亩产251公斤,总产454万多公斤,人均收入776元;全乡糖丝猪菜已成为农村经济的四大支柱。显然水利建设事业促进了山乡巨变。
In the early 1970s, Ningnan Hualan Township constructed a medium-sized storage project Ding-70 Reservoir (storage capacity of 13.68 million cubic meters). It irrigates more than 80% of the cultivated land in the township. Prior to bringing the reservoir to its effectiveness, Hua Tuo Xiang had only 72 kilograms of grain per mu in 1975, with a total output of 1.38 million kilograms and a per capita income of 41 yuan, with a single operation. After the reservoir exerts its benefits, by 1989, the output of grain has reached 251 kg per mu, with a total output of 4.54 million kilograms and a per capita income of 776 yuan. The sugarbeet dishes have become the four pillars of the rural economy. Obviously, water conservancy construction has promoted the tremendous changes in Shan.