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陕单21(原名陕单9704)是由西北农林科技大学农学院玉米所1997年用两个自选优良自交系杂交育成的优质、多抗、适应性好的玉米良种。2003年3月通过陕西省作物品种审定委员会审定,定名陕单21。1.品种特征特性该品种幼苗叶片窄,叶色深绿,生长势强,茎干粗壮,株型紧凑。株高230～250cm,穗位高95cm,雄穗分枝多,花粉量大,果穗筒型,穗长18～20cm,穗粗5.5-6.0,穗行数20～22,行粒数35左右,千粒重280～310g,马齿
Shan Shan 21 (formerly Shan Shan 9704) is a high-quality, multi-resistant and adaptable maize variety developed by the maize farm of Northwest A & F University in 1997 with two self-selected fine inbred lines. March 2003 approved by the Shaanxi Provincial Crop Variety Approval Committee, named Shan Shan 21.1. Variety characteristics of the varieties of seedling leaves narrow, dark green leaves, strong growth potential stem thick, compact plant type. Plant height 230 ~ 250cm, ear height 95cm, tassel branches and more, large amount of pollen, ear tube type, ear length 18 ~ 20cm, ear diameter 5.5-6.0, ear number 20 ~ 22, Thousand grain weight 280 ~ 310g, dentine