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一、大豆的生育特点:大豆的一生,可分为种子发芽与出苗、幼苗期、分枝期、开花期、鼓粒期和成熟期等六个发育阶段。全生育期早熟种为一百天左右,中熟种为一百二十天左右,晚熟种为一百四十天左右。据吉林省农科院对大豆品种小金黄一号的研究,当生育期为一百二十八天时,该品种的营养生长期出苗到顶叶停止生长︶约为八十天,生殖生长期︵花芽分化到成熟︶约一百余天.营养生长与生殖生长交错约为六十天左右。可以看出,与禾谷类作物相比,大豆的生育特点是,营养生长期与生殖生长期交错时间相当长,这是造成大豆产量不
First, the characteristics of soybean reproductive: Soybean’s life, can be divided into seed germination and emergence, seedling stage, branching, flowering, druming period and maturity of six developmental stages. The whole growth period of about 100 kinds of early maturity, medium maturing about 120 days, late maturing for about one hundred and forty days. According to the Jilin Provincial Academy of Agricultural Sciences on the small golden yellow soybean number one study, when the growth period of one hundred and twenty-eight days, the variety of vegetative growth period to the top of the parietal leaf to stop growth) is about eighty days, reproductive growth (flower bud Differentiation to maturity) for about a hundred days.Nutrition and reproductive growth staggered about sixty days. As can be seen, compared with cereal crops, soybean is characterized by fertility, vegetative growth and reproductive growth staggered quite a long time, which is caused by soybean yield is not