我省水稻良种推广自建国以来大体上分为四个阶段:1950～1956年评选利用优良农家品种,当时评出早三倍、天花落等品种,就地评选、就地推广;1957～1962年引入推广早籼莲塘早、南特号、陆财号和晚粳老来青等抗性较好、产量较高、熟期适宜的改良品种逐步代替地方品种,在良法的配套下,平均约增产16%左右;1963年以后高秆改矮秆,推广引入早籼矮脚南特、珍珠矮和晚粳农垦58等矮秆品种,逐步实现了水稻品种矮秆化,平均约增产40%左右;1977年后,浙南、浙中地区杂交晚稻代替部分常规晚稻,晚稻单产增长45%左右。良种的推广又促进了耕作制度的改革,历史上的“旱改水”、“单改双”、“问改连”、“二熟改三熟”,提高复种指数,合理调整品种布局和 Rice varieties in our province since the founding of the promotion can be divided into four stages: 1950 ~ 1956 selection and utilization of fine farmhouse varieties, was appraised as early as three times, the ceiling and other varieties, on-site selection, local promotion; 1957 ~ 1962 The introduction of the promotion of early indica Liantang early, Nanta, Lu Choi and late japonica Laolingqing higher resistance, higher yield, suitable for the mature varieties gradually replace the local varieties, with the good method of matching, the average yield increase About 19%. After 1963, the dwarf varieties with high stalks were changed, the dwarf varieties with early indica, dwarf Nantes, pearl dwarf and late japonica cultivar Nongken 58 were popularized, and the rice varieties were gradually dwarfed with an average increase of about 40% After 1977, late-season hybrid rice replaces part of conventional late-season rice in southern Zhejiang and central-east China, and yields of late-season rice increase about 45%. The popularization of fine varieties has also promoted the reform of the farming system. The history of “drought to water”, “single to double,” “ask to change even”, “two cooked three”, increase the multiple cropping index, rational adjustment of varieties and layout