杂交稻早夏制亲本生育特性研究及相关技术

１９９０～１９９２年对密阳４６、珍汕９７Ａ等６个主要制种亲本的生育特性和开花习性进行了观察、研 究，掌握了亲本在早夏制的变化规律及相关技术。

Studies on Growth Characteristics of Parents Used in Hybrid Rice Seed Production in Early Summer and the Relevant Techniques

The growth characteristics and flowering habits of six main parents for hybrid rice seed production including Milyang 46, Zhenshan 97A,etc. were studied. The results showed that the growth characteristics of identical parents varied with the season when they were used in seed production. The parents used in seed production in early summer were characterized by longer period from sowing to initial heading, longer vegetative growth stage, more tillers and effective panicles per plant,shorter heading and flowering stage, higher synchronization of flowering of both parents and concentrated blooming. The techniques corresponding to the characteristics as mentioned above were also proposed. The seed production in early summer makes it possible to raise multiple crop index and helps to increase yields and improve quality of seed production.