夏大豆茎叶生长及其与农艺性状的关系

Growth of Stem and Leaf of Summer Soybean and Its Relationship with the Agronomic Characteristics

为明确夏大豆茎叶生长及其与农艺性状的关系,对47个品种(系)进行了2a的定株观察试验。结果表明:大豆每长出1片复(真)叶,需3.2d,积温90.5℃;中熟品种主茎第9片复叶展开前后始花,12～13片复叶展开时结荚;主茎节数与叶片生长期、株高、单株荚数、单株粒数呈正相关,与百粒重呈负相关;叶片生长期与出苗～始花、花荚期、鼓粒期、出苗～始荚、生育期、叶片生长期占生育期比重呈极显著正相关。

In order to identify the growth of stem and leaf of summer soybean and its relationship with agronomic characteristics,47varities（lines） were observed for 2years.The results showed that the soybean need 3.2 days and90.5℃accumulated temperature to grow one compound（true） leaf;It began to flower when the 9 th compound leaf in main stem expanding for medium mature varities,to pod when the 12ed～13rd compound leaf in main stem expanding;Nodes of main stem was positive with leaf growth period,plant height,pods number per plant and seeds per plant,negative with 100-seed weight;Leaf growth period was extremely positive with seedling～flower stage,flower and podding stage,seed filling stage,seedling～podding stage,growth period,ratio of leaf growth period to growth period.