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南朝鲜的稻作科学工作者自1965年起用日本北海道的抗倒性极强的矮秆高产粳型品种虾夷与籼型品种台中本地1号、IR_8复杂交,1970年选出了偏籼型的新品种统一。其后又以统一或其姐妹系为亲本与IR_(24)等杂交,选育出了一系列半矮秆籼型高产品种密阳21、密阳22、密阳23、水原258、来敬等等。这些品种一般均有顶叶长而挺拔、秆矮穗大之特点,较粳型品种产量高,自1971年开始在南朝鲜推广,至1977年全面普及,取代了原有的粳型品种。此举对南朝鲜的水稻生产起了很大的推动作用,1977年的水稻单产较1970年提高了49.8％。
South Korean rice scientists from 1965 in Japan Hokkaido extremely resistant to high dwarf and high yield japonica varieties of shrimp and indica varieties Taichung Local 1, IR_8 complex mating, selected in 1970 Indosinian The new breed of unity. Subsequently, a series of semi-dwarf indica high-yielding cultivars Miryang 21, Miryang 22, Miryang 23 and Suwon 258 were bred by crossing with their sister lines or their sister lines with IR_ (24). Wait. These cultivars generally have the characteristics of long, flat top and short leaves, large stems and short spikes, higher yield than japonica varieties. They were popularized in south Korea since 1971 and were fully popularized in 1977, replacing the original japonica varieties. This move has played a significant role in promoting rice production in south Korea. In 1977, paddy output per unit area was 49.8% higher than in 1970.