通过对蓖麻南北两地性状表现的观察研究，对蓖麻生育的光周期特性进行初探，以期揭示蓖麻对光照环境的反应。结果表明，短日照条件有利于蓖麻通过光照发育阶段而促进生殖生长，使蓖麻主茎节数减少，叶片数减少，生育期缩短；长日照条件不利于蓖麻通过光照发育阶段而抑制生殖生长，使蓖麻主茎节数增多，叶片数增多，生育期延长。 Through observing and researching the characters of castor north and south, the photoperiod characteristic of castor was preliminarily probed to reveal the reaction of castor to light environment. The results showed that the short-day condition was favorable for castor to promote reproductive growth through the stage of light development, the number of main stems of castor was decreased, the number of leaves was reduced and the growth period was shortened. The long-day condition was not conducive to the inhibition of reproduction by castor during the light development stage Growth, so that the main castor bean node increased, the number of leaves increased, the growth period extended.