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Sc704玉米杂种优势大,丰产性能好,成热后茎叶青绿,适作青贮饲料,深受广大农牧民欢迎。1986年,全疆地方只有呼图壁县制种,面积为3800亩;1987年制种单位扩大到9个县(市),面积为9000多亩;现已有十几个县(市)要求制种,面积约为21000亩。但是,Sc704的母本ZPL773,比其父本ZPL717晚熟5天以上,制种时同期播种花期不遇;若错期播种,母本应比父本早播多少天,不同地区、不同年份很难掌握。例如,1987年呼图壁县于母本播种后第8天和第10天播父本,父母本花期相遇良好,但在
Sc704 maize heterosis, high yield performance, into a hot green stem and leaf, suitable for silage, welcomed by the majority of farmers and herdsmen. In 1986, only Hutubi County was planted in Xinjiang, with an area of 3800 mu. In 1987, its seed production was expanded to 9 counties (cities) with an area of 9000 mu. At present, there are more than a dozen counties (cities) Seed production, an area of about 21000 acres. However, Sc704’s female parent ZPL773 was late matured for more than 5 days than its male parent, ZPL717, and saw no flowering at the same time during seed production. If the wrong seed was sowed, the mother should be sowed more than the sow as early as the father, and it is difficult to grasp in different regions and years . For example, in 1987, Hutubi County sowed its parents on the 8th and 10th days after the sowing of the female parent, and the parents had good flowering times. However, in Hutubi County,