“双桂1号”是广东省农科院水稻所遗传综合技术育种室于1977年用晚造迟熟的“桂阳矮C_(17)”作母本,与“桂朝2号”杂交,应用组群筛选法育成的。在广州,作早造全生育期130天,比“桂朝2号”迟熟3～5天。1981年品比试验,平均亩产达1044斤,为19个参试品种之冠,比对照“桂朝2号”910.7斤,增产14.6％;每亩日产量为8.03斤,也是名列前茅。作晚造全生育期为125天。与“桂朝2号”相 “Shuanggui No.1” is a hybrid rice breeding program of genetic synthesis breeding center of rice in Guangdong Academy of Agricultural Sciences in 1977 with late maturing “Guiyang Dwarf C_ (17)” as the female parent, Application group screening method bred. In Guangzhou, made early for the whole growth period of 130 days, than the “Gui Chau 2” late 3 to 5 days. 1981 than the test, the average yield of 1044 pounds per mu, the highest number of 19 varieties tested, compared with the control “Gui Chau 2” 910.7 pounds, an increase of 14.6%; per mu yield of 8.03 pounds, is also among the best. Made late for the whole growth period of 125 days. And “Gui and Chao 2” phase