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《Soybean Science》 1983-03
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Zhang Guodong (Soybean Institute, Heilongjiang Academy of Agricultural Sciences)  
After the establishment of the People's Republic of China, more than eight cultivars are developed and released in Heilongjiang Province. These cultivars come from several main parents (such as Mancang-jin, Zihua 4, Yuanbaojin and Fengdihuang) and thier derivatives (such as Dongnong 4, Jingshanpu and Kejiao 56-4258 etc.). Crossed with these and other cultivars togather with radiation treatment, a lot of good cultivars with early maturily, higher yield and good quality were developed. Thus the pedigree of soybean cultivars grown in Heilongjiang Province becomes more and more complicated.In view of the fact that released cultivars in Heilongjiang Province mainly come from few common ancestess vith litte genetic differentiation and similar performance, it is difficult to develop outstanding cultivars on the basis of these germplasms. We suggest that in order that we can develop soybean cultivars with early maturity, high yield, good quality and stress resistance, parents used in hybridization should with enough genetic differentiation and their important characters can be complementary to each other.It is necessary to enhance the study of soybean cultivar resource utilization and enrich the genetic bases of soybean.
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