榆林市是国家级杂交玉米制种基地,年杂交玉米制种申报面积6000hm2左右。其中榆阳区杂交玉米制种地面积占全市的75%。由于榆阳区位于毛乌素沙漠南缘,天然隔离条件好,加上地下水资源丰富,日照长、昼夜温差大,以及畜牧业所提供的有机肥料充足等优越条件,吸引了大批省内、外种子生 Yulin City, is a national hybrid corn seed base, the annual hybrid corn seed coverage area of ​​about 6000hm2. Among them, Yuyang District hybrid corn planting area accounted for 75% of the city. As the Yuyang District is located in the southern margin of the Mu Us Desert, with good natural isolation conditions, coupled with its abundant groundwater resources, long sunshine duration, large temperature difference between day and night, and abundant organic fertilizers provided by animal husbandry, Yuyang District has attracted a large number of domestic and foreign seed births