一、我省棉花良种推广及目前退化情况解放初期,我省沿江棉区主要种植德字五三一品种,淮北棉区主要种植斯字二B品种。1952年前东流棉場引进岱字十五号,通过区域試驗,皮棉比德字五三一增产11.25%,1953年試驗增产29.8%,并在东流、貴池等地示范,取得同样結果。1954年沿江棉区开始推广岱字十五号,至1956年全面普及。1956年肖县棉花原种繁育場举行的区域試驗中,岱字十五号比斯字二B增产20%。淮北棉区于1957年开始推广,至1959年全面普及。1959年后,岱字十五号种植面积約占全省棉田面积的95%左右。 First, the promotion of cotton varieties in our province and the current degradation of the liberation of the early period, the province’s cotton growing along the Yangtze River in May 31 varieties, the main cotton varieties planted in northern Jiangsu II B varieties. Before 1952, Dongli Cotton Field introduced Dai-Dai No. 15, and through regional tests, the lint yield increased by 11.25% compared with that of May 31 and increased by 29.8% in 1953. The same result was obtained from the demonstration in Dongliu and Guichi etc. . In 1954, the area along the Yangtze River began to promote Dai Zi No. 15 and was fully popularized in 1956. In 1956 Xiaoxian cotton seed breeding field trials held in Dai Dai word on the 15th Bisi two B 20% increase. Huaibei cotton area began to promote in 1957, fully popularized in 1959. After 1959, the Dai 15th planted area accounts for about 95% of the province’s cotton area.