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徐州市大白菜杂交制种工作,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1978～1981四年制种工作看出:(一)每亩结荚数是构成种子单产的重要因素.亩产50与200斤,相差3倍,每亩荚数从70～210万荚,相差两倍,两者之间的关系程度较大.而每荚平均结粒数只相差0.41～2.58粒,种子千粒重相差在0.22～0.72克之间,对产量关系较小.从山东4号这一组合的单株荚结构来看,结荚以第一、二级分枝为主,其结英数占全株87.07～90.15%,种子产量占全株的90%以上.在一般情况下,要获得1斤大白菜杂交种子,需要1.1～1.6万个种荚.
Xuzhou cabbage hybrid seed production, from 1978 small area seed production development to 70 acres in 1981, per mu yield increased from 50 to 60 kg to 155.2 kg in 1981 harvest Chinese cabbage 10865 pounds of hybrid seed from 1978 ~ 1981 four kinds of seed production work see: (a) pod per acre is the number of seed constitutes an important factor in yield per mu 50 and 200 pounds, a difference of 3 times per acre pods from 70 to 2.1 million pods, a difference of two Times, the degree of the relationship between the two larger.And the average number of particles per pod only a difference of 0.41 ~ 2.58 seeds, seed thousand weight difference between 0.22 ~ 0.72 grams, less on yield.From the combination of Shandong 4 Single pod structure, the pod to the first and second-grade branches dominated, the number of its junction accounted for the whole plant 87.07 ~ 90.15%, seed production accounted for more than 90% of the whole plant in general, to obtain 1 Kg of Chinese cabbage hybrid seeds need 1.1 to 16,000 species of pods.