7Fehr W R, Caviness C E. Stages of Soybean Development. Spe-cial Report 80, Cooperative Extension Service, Agriculture andHome Economic Experiment Station[ M] . Iowa: Iowa State Uni-versity ,1977 : 1-11.
8Carpentleri-Pipolo V, de Almeida L A, Kiihl RAD. Inheritanceof a long juvenile period under short-day conditions in soybean[J]. Genetics and Molecular Biology, 2002,25(4) : 463-469.
9Reicosky D A,Orf J H,Poneleit C. Soybean germplasm evalua-tion for length of the seed filling periodf J]. Crop Science, 1982,22(2): 319-322.