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我区杂交水稻早造制种期间气温由低到高,且不稳定,遇到寒潮的机会也多,使恢复系秧田期和大田生产前期受到较大影响,从播种到始穗天数难以掌握。不育系一般在气温已趋稳定后播插,生育期变化不大。因此要较好地解决花期相遇问题,必须正确掌握恢复系的生育期,在这基础上适当调整不育系的播种期。一九七五年以来,我区很多单位在早造制种中就如何较好地掌握父母本的播种错期,作了不少调查研究。认为早造制种父母
Early hybrid rice in our region during the early seed production temperature from low to high, and unstable, the chances of encountering cold are also more so that the restoration of seedling field and field production has been greatly affected, from sowing to the beginning of spike days is difficult to grasp. Sterile lines generally have stabilized after the temperature sowing, little change during the growth period. Therefore, in order to solve the problem of flowering encounters well, we must correctly understand the growth period of the restorer line, and on this basis, adjust the sowing date of the CMS line. Since 1975, many units in our district have done a lot of investigations and studies on how to better master the planting period of their parents in early seed production. Think early to create seed parents