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徐州市大白菜杂种工作,从1978年小面积制种发展到1981年70多亩,每亩单产由50-60斤提高到155.2斤.1981年收获大白菜杂交一代种子10865斤.从四年制种工作看出:(一)每亩结荚数是构成种子单产的重要因素.(二)每荚平均结籽数因品种、株系亲和指数以及花期相遇情况而异,各自交系的结荚、结实率差异很大.(三)种子千粒重的高低,主要决定于开花早晚及种子在荚时间长短.一般情况下,同一株上开花早
Xuzhou cabbage hybrid work, from 1978 small area seed production development to 70 acres in 1981, per mu yield increased from 50-60 pounds to 155.2 kg in 1981 harvest Chinese cabbage 10865 pounds of hybrid seed from the four-year The results show that: (1) The number of pods per acre is an important factor that constitutes seed yield (b) The average number of seeds per pod varies with the variety, lineage affinity index and flowering encounter, Pods, seed setting rate varies greatly. (C) the level of seed grain weight, mainly depends on the flowering sooner or later and the seed pod length of time. Under normal circumstances, the same plant flowering early