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大豆是短日照作物,到一定的临界光照才能开花。临界光照以下出苗到开花天数随光照缩短而减少。在贵阳(北纬26°35′)大豆生长期的自然光照下,经遮光缩短光照对国内有代表性大豆品种进行试验结果,其短光敏感性程度依次为南方夏大豆,北方夏大豆,南方春大豆和北方春大豆。而我省低纬高原大豆自海拔1000m以上短光敏感性随高度提高。经平均光周期近似值为14L+10D(自然光照),12L+12D,10L+14D,8L+16D等处理试验,结果后面两个处理的出苗到开花天数不再比12L+12D缩短。即加快发育要求的短光照有一定的限度。品种对缩短光照反应敏感程度还表现在花期缩短,从而提早成熟。结荚率提高,秋荚率减少,并增加百粒重。因而在生产实践中利用相对较长光照以延长营养生长期与开花期,之后在相对较短光照以提高结荚鼓粒的数量与质量极为有利
Soybean is a short-day crop, to a certain critical light to flowering. The number of days from emergence to flowering below critical light decreased with light shortening. Under the natural light of soybean growth period of Guiyang (latitude 26 ° 35 ’), the short light sensitivity of the representative soybean cultivars in China were tested by shading and shortening the light intensity, followed by Southern Summer Soybeans, Northern Summer Soybeans, Southern Spring Soybeans and northern spring soybeans. The low-latitude plateau in our province from above 1000m above sea level short-wave sensitivity increased with height. The average photoperiod was 14L + 10D (natural light), 12L + 12D, 10L + 14D, 8L + 16D and other treatments. As a result, the days from emergence to flowering of the latter two treatments were no longer shorter than 12L + 12D. That is to speed up the development of short-term requirements have a certain limit. Varieties to reduce the sensitivity of light response is also reflected in the flowering shortened, thus early maturity. Pod rate increased, autumn pod rate decreased, and increase the weight of 100. Thus it is extremely advantageous to use relatively long light to prolong the vegetative and flowering periods in production practice and then to increase the amount and quality of the pod bulbs at relatively short lighting