海南岛三亚市的南繁基地,位于祖国最南端,是我国得天独厚的天然大温室,是农作物育种好地方,每年冬春期间,全国20多省、市、自治区、五六百个科研、生产单位来育种, 育种作物有20余种。60年代选育种单位不多,面积不大,作物以两杂(杂交玉米、高粱)为主。70年代南繁面积逐年扩大,中期进入三杂(两杂加杂交水稻)良种,面积以1977年度为 Sanya City, Hainan Island, Fanfan base, located in the southernmost tip of the motherland, is China’s unique natural large greenhouse, a good place for crop breeding, annual winter and spring, the country more than 20 provinces, municipalities and autonomous regions, five or six hundred research and production units To breeding, breeding more than 20 kinds of crops. Sixty breeding breed small units, small area, crop with two hybrid (hybrid corn, sorghum) based. In the 1970s, the area of ​​Nanfan flourished each year, and in the middle period it entered the three-hybrid (hybrid rice with two hybrids) varieties. The area was 1977