早稻不论籼、粳,感温性都较强,而感光性和短日高温生育性较弱,所以感温性是支配早稻出穗早晚的主导因子。感光性弱是早稻能在夏季生长条件下出穗的前提。早稻籼与早稻粳的主要区别特点,在于早稻籼一般比早稻梗出穗期晚,有利于在南方早季高温条件下保持较稳定的生育日数与一定的繁茂性,是一种充分利用南方早季高温环境的生态特性。早稻梗的短日高温生育性弱,能适应较低温的条件, Early rice, regardless of indica, japonica, are strong sense of temperature, and sensitivity and short-term high temperature fertility is weak, so the temperature control is dominated early rice early rice earliest leading factor. Sensitive weakness is a prerequisite for early rice to emerge in the summer under the conditions of growth. The main difference between early indica rice and early japonica rice is that early indica rice is generally later than the earliest heading date of the early rice crop and is conducive to maintaining a relatively stable number of birth days and a certain degree of lushness under high temperature in the early morning in the south. Ecological characteristics of high season environment. Early rice stem short-day high temperature fertility is weak, can adapt to the conditions of lower temperature,