1目的意义黑龙江省的第六积温带上限是我国北部较寒冷的大豆主产区,大豆是该地区的主要种植作物。因此大豆产量的高低直接影响当地农民的经济收入。栽培密度是影响大豆产量的最主要因素之一,其与产量的相关程度达到极显著水平。在大豆的产量构成要素之中单位面积株数是最易 1 Purpose The upper limit of the sixth accumulated temperate zone in Heilongjiang Province is the coldest soybean producing area in northern China. Soybean is the main crop in the area. Therefore, the level of soybean production directly affects the economic income of local farmers. Cultivation density is one of the most important factors that affect the yield of soybean, and its correlation with yield reaches extremely significant level. Among the components of soybean yield, the number of strains per unit area is the easiest