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选用中国大豆主要生态区的代表品种１２个，在南京（３２°Ｎ）春播，通过人工光照处理，比较了各类型品种开花前和开花后光周期反应敏感性的差异。结果表明，１２ｈ短光照处理使所有品种的开花期显著提前（Ｐ＜０．０１）；开花后进行短日照处理，使除早熟品种东农３６和泰兴黑豆以外的其它品种成熟期显著提前（Ｐ＜０．０１）。在本试验条件下，南方夏大豆品种开花后光周期反应比开花前更加敏感，其它类型品种开花前光周期反应比开花后敏感或前、后期敏感性接近。相关分析表明，大豆开花前和开花后的光周期反应敏感性，与自然光照下相应发育时期的长度正相关。较长的前期有利于单株粒数和单株产量的提高，较长的后期对提高百粒重有利。文中讨论了大豆品种开花前、开花后光周期反应敏感性与原产地日照长度及其它环境因子的关系。
Twelve representative varieties of soybean in China were selected and spring sowed in Nanjing (32 ° N). The differences of photoperiod sensitivity between different varieties before and after flowering were compared by artificial light treatment. The results showed that the flowering stage of all varieties was advanced significantly (P <0.01) after 12 h of short-light treatment. The short-day treatment after flowering accelerated the maturity of varieties except Dong Nong 36 and Taixing Black Bean (P <0.01). Under the experimental conditions, the photoperiod response of the southern summer soybean varieties was more sensitive than that before flowering. The photoperiodic response of other varieties was more sensitive than that before flowering or close to the early and late flowering. Correlation analysis showed that photoperiodic response sensitivity of soybean before flowering and after flowering was positively correlated with the length of corresponding developmental period under natural light. Longer prophase is conducive to increase the number of grains per plant and yield per plant, the longer the late to improve the weight gain of 100. The relationship between the photoperiod sensitivity of soybean varieties before flowering and after flowering and the sunlight length of origin and other environmental factors were discussed in this paper.