崖城地区汕优6号制种播种期的调查研究

笔者通过调查研究认为:崖城地区杂交水稻制种适宜扬花期是3月中旬至5月上旬,最佳扬花期是4月5日至5月上旬。汕优6号制种中 IR26(父本)适宜播种期是11月12日至翌年1月30日,它的最佳播种期是12月7日至翌年1月—5日,在 IR26秧苗8.5片叶左右时播种珍汕97A(母本)为宜。但是,确定播种期除了根据最佳扬花期之外,还必须注意四个问题:(1)制种田的水利条件;(2)制种田与周围稻田不同品种之间的花期应错开;(3)亲本种子贮存的时间长短;(4)病虫发生为害的规律。

The investigation for sowing time of the parents of Sbanyou 6 for producing hybrid seeds in Yacheng area

After investigating,the author concludes that in Yaeheng area the suit- able florescence of producing hybrid rice seed is from March 11 to May 10. The best flowering date is from April 5 to Mug 10.If the parents of Sha- nyou 6 are used to produce hybrid seeds,the suitable sowing time of IR26 (male parent)will be from Nov,12 to Jan,30 of the next year,the best is from Dec,7 to Jan,15 of the next year,and the seeding time of Zhin- shun 97 A(female parent)is at the time when IR26 seedling have grown into 8,5 leaves,But to time sowing,besides basing on the best florescence, there are four questions which must be noticed: (1)Irrigation condition of producing hybrid seeds' paddy field. (2)The florescence of different variety between producing field and surrounding rice field must be staggered off. (3)The objective law of plant diseases and insect pest which were prevalent at that time. (4)The length of time when parent seeds have been stored.