海南区于1975年冬至1976年春在自治州南红良种繁育场举办了“三系”育种学习班。通过理论学习和生产实践,初步掌握了水稻“三系”繁殖、制种技术。1976年早造配制杂种20亩,共收杂种2315斤。其中“矮优2号”17.4亩,平均亩产121.4斤;“汕优2号”2.6亩,平均亩产77.7斤,20亩平均每亩收杂交种子115.7斤。每亩收获父本(“IR24”)393斤。一、制种技术 1.播种育秧选排灌方便、肥力较好,阳光充足的田块做秧地,多犁多耙,做合式秧畦,方便除杂及 Hainan District in the winter of 1975 to the spring of 1976 held a “three lines” Breeding course in the South red elite breeding grounds. Through theoretical study and production practice, preliminary mastered the “three lines” of rice breeding, seed production technology. As early as 1976, twenty acres of mixed hybrids, a total of 2315 pounds of hybrids received. Among them, “Dwarf Excellent 2” 17.4 mu, average yield 121.4 kg; “Shanyou 2” 2.6 acres, an average of 77.7 kg per mu, 20 mu received an average of 115.7 pounds per acre hybrid seeds. Grains per acre harvest (“IR24”) 393 pounds. First, the seed production technology 1. Sowing seedling selection Irrigation and drainage convenient, better fertility, sunshine sunny plots to do seedlings, more plow and more rake, so that the joint Yang Zhuo, easy impurity removal and