甘肃省中部干旱地区,西起东乡、永登,东到陇山,北至景泰,南到陇西、秦安,总土地面积约6.86万平方公里。耕地2,100万亩,其中有效灌溉面积仅占13％,绝大部分缺乏灌溉条件,土壤水分无地下水源补给,完全依赖大气降水。据气象部门分析,中部地区小麦需水最多的拔节至开花灌浆期(5—6月)的降雨量与定西地区夏田单产的关 Arid areas in central Gansu Province, west of Dongxiang, Yongdeng, east of Longshan, north of Jingtai, south Longxi, Qin’an, the total land area of ​​about 68,600 square kilometers. 21 million mu of arable land, of which only 13% of the effective irrigation area, the vast majority of the lack of irrigation conditions, no groundwater recharge of soil moisture, completely dependent on atmospheric precipitation. According to the analysis by meteorological department, rainfall in the central part of the country with the highest demand of wheat in spring and summer