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陕单9号在生产上大面积推广以后,出现种子供不应求的矛盾。为此我们对其双亲进行了改良,用武Mol7作母本制种可同期播种。一般亩产175—200kg,杨陵区南庄村1987年夏播改良陕单9号800余亩,平均亩产325kg,高者达500kg 以上。其主要技术措施是:1.适时播种掌握玉米开花时气温以不超过25℃,相对湿度不低于75％为宜。适时早播争取在7月中,下旬高温干旱来临之前抽雄散粉。有的自交系如武 Mol7、武109A、沈5、掖107等在抽雄时不耐高温,遇伏旱易造成花粉量少,授粉不良,其播种时间更应适时偏早。但切忌过早,不然前期温度过低,
Shandan 9 in the production of a large area to promote after the emergence of the contradiction between supply of seeds. To this end we have improved their parents, the use of Mol7 as a maternal plant can be planted in the same period. General mu 175-200kg per mu, Yangling District Nanzhuang Village Summer Summer Broadcasting Improvement Shan Shan No. 9 800 acres, the average per mu yield of 325kg, the highest of more than 500kg. The main technical measures are: 1. timely sowing master corn flowering temperature not exceeding 25 ℃, relative humidity of not less than 75% is appropriate. Timely early fight for fight in mid-July, late high temperature and drought before the arrival of male powder scattered. Some inbred lines such as Wu Mol7, Wu 109A, Shen 5, Ye 107, etc. are not heat-resistant at the time of tasseling, drought prone to cause less pollen, poor pollination, the sowing time should be timely. But should not be too early, or early temperature is too low,