关键词: 大豆, 光照长度, 农艺性状, 板栗林, 氮, 迁移, 径流, 集水区

Abstract: The effects of post-flowering daylength on the agronomic character, and the relationship between length of developmental stages and agronomic characters are studied under photoperiod-controlled conditions. The results show that long day can increase the dry matter accumulation and increase the seed yield provided the maturation is normal. The filling duration is positively related to the seed size and yield, and the durations of flowering and podding are important for the yield as well. It is proposed that in northeast China, the long day before and during flowering and podding of soybean is favoring of the dry matter accumulation and the production of more flowers and pods, while the quickly shortened daylength after early filling can enhance the translocation of photosynthates to seeds and hasten seed maturation.

Key words: Soybean, Daylength, Agronomic character, watershed, runoff, migration, Chinese chestnut forest, nitrogen