开花前，对日长要求不严格。
Before inflorescence, the day length requirement was not strict.
开花前 ，两极核融合成次生核 ，或不融合仍保留极核状态。
Two polar nucleis fuse into the secondary nucleus, or they dontt fuse before the anther shed.
试验研究了开花前不同光照处理对大豆开花后的发育、产量形成和品质性状的影响。
The effects of pre- flowering photoperiodic treatments on the post-flowering-development, yield formation and chemical quality of soybeans were studied.
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