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对我所１９８６～１９９３年大豆丰歉定位试验结果初步分析得出：当地的中熟品种丰歉年的产量波动幅度为６２．１％，影响大豆产量不移的主要因素是５～９月的气象要素分布。形成丰歉年的关键是６月中旬茎的干物质和６月下旬的植株生长，在该时段茎的干物质多，植株生长速度快，为形成丰年奠定了基础，否则为歉年；大豆的植株生长动态表现为“Ｓ”型曲线，干物质积累在鼓粒后丰年多，歉年少。其中，荚积累的干物质丰年始终多，歉年始终少，表现明显的规律性。
The preliminary analysis of the results of soybean apotosis positioning tests from 1986 to 1993 in our country shows that the fluctuation of the yield of the medium maturity cultivars in the region is 62.1%, and the main factor affecting the yield of soybean is from May to September Meteorological elements of the distribution. The key to the formation of an apology year is the dry matter of the stem in mid-June and the plant growth in the late June. During this period, the dry matter of the stem is more and the plant grows faster, which lays the foundation for the formation of a rich year. Plant growth dynamic performance of the “S” -type curve, dry matter accumulation in the drum after the abundance of years, fewer years of apologies. Among them, pods accumulated abundant dry matter has always been more, less always the year of apology, the obvious regularity.