开花后光照长度对大豆农艺性状的影响

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．

Effect of post-flowering daylength on agronomic characters of soybean

The effects of post-flowering daylength on the agronomic character, and the relationship between length of developmental stages and agronomic characters are studied under photoperiod-controlled conditions. The results show that long day can increase the dry matter accumulation and increase the seed yield provided the maturation is normal. The filling duration is positively related to the seed size and yield, and the durations of flowering and podding are important for the yield as well. It is proposed that in northeast China, the long day before and during flowering and podding of soybean is favoring of the dry matter accumulation and the production of more flowers and pods, while the quickly shortened daylength after early filling can enhance the translocation of photosynthates to seeds and hasten seed maturation.