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宁夏北部引黄灌区地处我国内陆中部偏北的温带干旱区,年日照时数3 000小时左右,年平均气温8~9℃,年大于0℃积温3 700℃左右,年大于10℃的积温为3 200~3 300℃,平均无霜期150~195天,耕地面积约700万亩,土壤肥沃,受黄河灌溉之利,生产小麦、水稻、玉米等粮食作物。针对宁夏引黄灌区“一季有余,两季不足”的矛盾,及单种玉米和水稻复种指数较低的问题,2014年以来,开展了冬牧70
The Yellow River Diversion Irrigation District in northern Ningxia is located in the temperate arid northward of the central inland of our country. The annual sunshine duration is about 3,000 hours. The average annual temperature is 8 ~ 9 ℃. The annual accumulated temperature above 0 ℃ is about 3 700 ℃ and the annual is more than 10 ℃ Accumulated temperature of 3 200 ~ 3 300 ℃, the average frost-free period of 150 to 195 days, about 7 million acres of arable land, fertile soil, the Yellow River irrigation benefits, the production of wheat, rice, corn and other food crops. In view of the contradiction of Ningxia Yellow River irrigating area, “more than one season, less than two quarters” and the problem of single crop of maize and rice,