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研究证明:播种至三叶期,品种间无差异,积温起作用.三叶至生理拔节期,品种间差异显著。春型品种以高温、长日光周期为宜;半冬型、冬型品种则以低温短日光周期为宜.生理拔节至开花期,不同类型品种对温光反应存在着一定的差异,是随春型到冬型增强对光周期反应而敏感,对温度的反应而迟纯。开花至成熟,品种间差异较小.高温.长日光周期能显著缩短持续期。分析进一步证明,从一个种性看,发育阶段持续时期似乎彼此是独立的,这表明可改变某一个发育阶段,而不能同时改变其它发育阶段.
Studies have shown that: sowing to three-leaf stage, no difference between varieties, accumulated temperature play clover to physiological jointing, significant differences between varieties. Spring type varieties with high temperature, long daylight cycle is appropriate; semi-winter type, winter-type varieties are low temperature and short day cycle is appropriate physiological jointing to flowering stage, different types of light and temperature response to the existence of certain differences, Winter-type enhancement is sensitive to the photoperiodic response, and the response to temperature is pure. Flowering to maturity, small differences between varieties. High temperature. Long daylight cycle can significantly shorten the duration. The analysis further demonstrates that, in one species, the duration of developmental stages appears to be independent of each other, suggesting that one developmental stage can be changed rather than the other at the same time.