我县自1976年推广杂交水稻以来,一直沿用汕优二号、汕优六号等组合,这些组合由于制种产量低、成本高,致使制种面积逐年缩减,如1982年全县制种3000余亩,到1985年仅有600亩左右。同时,这些组合又由于使用年代较长,已有抗性减退、优势下降的趋势。杂交水稻在我县推广多年,栽培历史长,种植面积大,但因出现上述两种情况,近年来种植的面积也出现下降趋势。为继续推广杂交水稻,发挥杂种优势,夺取优质丰产,寻找一个更适于本地制种栽培的新组合,就成为一项紧迫的任务。 选用什么新组合呢?既要易制种,又要 Since the popularization of hybrid rice in 1976, our county has been using combinations of Shanyou 2 and Shanyou 6 for a long time. Due to the low seed production and high cost, Mu, only about 600 acres in 1985. At the same time, due to the long service life and the diminished resistance of these combinations, their advantages have been declining. Hybrid rice was popularized in our county for many years, with a long history of cultivation and a large planting area. However, due to the above two situations, the area planted in recent years also showed a downward trend. In order to continue popularizing hybrid rice, exerting heterosis, seizing high yield and finding a new combination more suitable for local seed production, it becomes an urgent task. What new combination of choice? It is easy to seed, but also