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城固县柳林公社1977年第一次试种杂交水稻二九南1号不育系繁殖田2亩,亩产221斤,其中:不育系种子103.5斤,保持系种子117.5斤。在技术措施上,主要抓了以下几点。一、选择安全授粉期,确定适时播种期。不育系要靠保持系供给花粉才能结实。因此,掌握安全授粉期,适时播种,搞好花期相遇,是不育系繁殖成败的关键。二九南1号不育系,生长期较短,开花最适宜气温23～32℃,湿度70～90％,据我县气象资料,七月下旬至八月中旬,平均气温为26～26.7℃,相对湿度为76.2～80％,正是不育系繁殖安全授粉的良好季节。繁殖田前茬为小麦,土壤肥力中等,
Chengli County Liulin commune for the first time in 1977 to test hybrid rice Erjiamun 1 CMS sterile field 2 acres, 221 kg per mu, of which: sterile seed 103.5 kg, maintaining the Department of 117.5 kg of seeds. In technical measures, the main catch the following points. First, choose a safe pollination, to determine the appropriate sowing period. Sterile lines to rely on to maintain the Department of pollen supply to strong. Therefore, to grasp the safe pollination, timely sowing, do a good job in the flowering period is the key to the success or failure of CMS breeding. Two nine south 1 sterile line, the growth period is shorter, the most suitable flowering temperature 23 ~ 32 ℃, humidity 70 ~ 90%, according to meteorological data, from late July to mid August, the average temperature of 26 ~ 26.7 ℃ , Relative humidity of 76.2 ~ 80%, it is a good season breeding insemination safety pollination. Before breeding crop wheat is wheat, soil fertility is medium,