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笔者在海南岛乐东县和湖南省江永县杂交水稻制种田中,观察IR_(661)(1,026朵小花)和IR_(26)(674朵小花)的开花情况,现将结果整理如下,供制种参考。一、单穗开花情况选择穗头刚露剑叶环的稻穗为观察对象,发现IR_(661)、IR_(26)先于母本(二九南不育系和V20不育系)1—3天(平均1.8天)开花。生产中要求母本比父本早抽穗2—3天,以便调节花期是恰当的。单穗从始花至终花的时间,IR_(661)在江永县需8—9天,以8天的为多(占85.7％);IR_(26)在乐东
The author observed the flowering of IR_ (661) (1,026 flower) and IR_ (26) (674 flower) in Ledong County, Hainan Island and Jiangyong County, Hunan Province. The results are summarized as follows Seed production reference. First, the flowering of single spikes Select the panicle of spike head just ring the paddy for observation, found IR_ (661), IR_ (26) prior to the female parent (two nine South sterile and V20 sterile line) 1- 3 days (average 1.8 days) flowering. Production required that the female parent should be heading 2-3 days earlier than the parent in order to adjust the flowering season. IR_ (661) takes 8-9 days in Jiangyong County, taking more than 8 days (85.7%); IR_ (26)