Study on the Flowering Predictable Method and Control during Hybrid Three Lines of Rice Seed Production

Based on the research and practice of three lines of rice hybrid seed production,many kinds of cause that bring asynchronous flowering period were analyzed,and flowering period predictable methods such as leaf-age,young male spike differentiation etc. were proposed. Simultaneity,the measures of control and remedy,fat regulating,water transfer,seedling age adjustment were put forward. It is important to instruct rice seed production and improve the seed yield that these methods are applied to hybrid rice seed production.