1950年,我省开始推广岱字15号棉花良种,1955年基本普及,更换了中棉和小洋花,平均亩产提高20—40%,纤维长度由20毫米左右上升到28毫米以上。从1970年开始,我省用国内自育品种逐步更换岱字15号,1979年已推广通棉5号、泗棉1号,徐州142、沪棉204良种442.6万亩,占棉田面积的一半。现有50%的棉田实现了年年三代原种一更新。现将我省棉种工作作一简单介绍。 In 1950, the province began to promote the Dai No. 15 cotton varieties, the basic popularity in 1955, the replacement of cotton and small ocean flowers, the average yield increased by 20-40%, the fiber length increased from 20 millimeters or more to 28 millimeters. Since 1970, our province gradually replaces Dai Zi No. 15 with domestic self-breeding varieties, and in 1979, it has promoted 4,426,000 mu of fine cotton varieties of No.204, No.1 in Simian, No. 142 in Huzhou Cotton and No.204 in Shanghai Cotton, accounting for half of the total cotton area. The existing 50% of the cotton fields have achieved an annual update of three generations of original seeds. Now my cotton work as a brief introduction.