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在人工控制条件下，研究了开花后的光照长度对大豆农艺性状的影响及大豆不同发育阶段长度与农艺性状的相关性．结果表明，开花后长日照可提高大豆的干物质积累量，在正常成熟的前提下可明显提高产量．试验进一步证明鼓粒期长度与粒重和产量呈正相关，花荚期长度对产量形成相当重要．认为东北大豆花荚期及以前的长日照有助于干物质的积累和较多花荚数量的形成，鼓粒开始后迅速缩短的日照条件可促进干物质向籽粒的运转，并加快籽粒的整齐成熟．
Under artificial control conditions, the effects of light length after flowering on the agronomic characters of soybean and the relationship between length and agronomic characters of soybean at different developmental stages were studied. The results showed that the long sunshine after flowering could increase the dry matter accumulation of soybean, which could obviously increase the yield under the condition of normal maturation. The test further proves that the length of drum stage is positively correlated with grain weight and yield, and the length of flowering stage is very important for yield formation. It is believed that the flowering period and the long sunshine period of northeast soybean contribute to the accumulation of dry matter and the formation of more flowering pods. The sunshine conditions that rapidly shorten after the initiation of puffing can promote the operation of dry matter to the grain and speed up the tidiness of the grain mature.