陇单9号是甘肃省农科院作物所以自育系ly0996为母本、自育系ly8406为父本杂交选育而成的玉米单交种,甘肃省玉米区域试验表明,陇单9号比对照品种郑单958增产7.43%,高抗茎基腐病、大斑病、红叶病,中抗丝黑穗病、瘤黑粉病、矮花叶病。适宜在甘肃省河西及中东部年有效积温在2 600℃以上的地区推广种植。 Longdan 9 is the crop of Gansu Academy of Agricultural Sciences so self-breeding system ly0996 as the female parent self-breeding line ly8406 as the male parent cross-breeding of corn single cross-species, Gansu Province corn regional trials showed that Longdan 9 than Control variety Zhengdan 958 yield 7.43%, high resistance to stem rot, Great blotch, leaf disease, resistance to head smut, nematode disease, dwarf mosaic disease. It is suitable to promote planting in Hexi and Middle East of Gansu Province where effective accumulated temperature is above 2 600 ℃.