在大豆大培上,北京五十年代前是以春作大豆为主的。后来由于冬小麦面积的不断扩大,和一年两熟制在平原水浇地区的发展,因此提出了发展夏播大豆的要求。夏大豆高产,要求相应的品种,种植方式和栽培技术。我们于1982年—1983年,探讨了夏播条件下密度对大豆生长发育的影响,以及影响产量提高的主要因素,现报告如下。 On the big cultivation of soybeans, Beijing was mainly made of spring soybeans before the 1950s. Later, due to the continuous expansion of the winter wheat area and the development of two-cropping system in the irrigated area of ​​the plain in one year, the demand for developing summer sowing soybean was put forward. Summer soybean yield, requiring the appropriate varieties, planting methods and cultivation techniques. We from 1982 to 1983, to explore the summer sowing conditions on the growth and development of soybean density, and the main factors affecting the yield, are as follows.