播期是能够充分利用水、光、气、热气候资源，使作物高产稳产的关键性廉价措施。建三江地处北纬47度以北的高寒地区，关注播期，尤为重要。本试验试图探讨三江地区大豆早播始期以及缩短播期的上下限。对指导大豆生产实践具有一定的现实意义。一、材料与方法试验地设在建三江分 Sowing date is a key and cheap measure that can make full use of water, light, gas and hot climatic resources to make crops high and stable. Jian Sanjiang is located in north latitude 47 degrees north of the alpine region, concerned about the sowing date, is particularly important. This experiment tries to discuss the early sowing date of soybean in Sanjiang region and shorten the sowing date. It has certain practical significance to guide the practice of soybean production. First, materials and methods Experimental site located in Sanjiang points