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一、近年早稻品种搭配的变化推广良种和合理搭配,是夺取全年粮食高产的重要措施。近几年来,随着水稻中熟品种的抗性和产量的提高,以及杂交晚稻高产品种的推广,我市的早稻品种搭配,发生了二个明显的变化:1.中熟品种浙辐802、二九丰的面积迅速扩大,改变了以往迟熟品种广陆矮4号为主的搭配格局。1982年前,我市迟熟品种的搭配以广陆矮4号为主,约占70%～75%,广陆矮4号的亩产一般要比中熟品种增产50公斤左右。后来,随着浙辐802、二九丰品种的推广,迟熟品种广陆矮4号的产量与中熟品种的产量的差距有所缩小。例如我市1984、1986、1987、1989四年区试,除了1987年迟
First, in recent years, the varieties of early rice varieties to promote the promotion of a good variety and reasonable, is an important measure to seize the annual grain yield. In recent years, with the maturity of rice varieties and yield increased, and the promotion of hybrid late rice high yield varieties, the city’s early rice varieties, there have been two significant changes: 1. Medium-maturing varieties of Zhejiang spokes 802, Yuk Choi quickly expand the size of the area, changing the late maturing variety Guanglu Dwarf 4 with the main pattern. Before 1982, the mix of late-maturing varieties of our city was dominated by Guanglu Dwarf No. 4, accounting for about 70% -75%. The yield per mu of Guanglu Dwarf No. 4 was about 50 kg more than that of middle-maturing varieties. Later, with the promotion of Zhejiang Spoke 802 and Yuk Fung varieties, the difference between the yield of late maturity cultivar Guanglu Dian 4 and that of medium maturing varieties narrowed. For example, the city 1984,1986,1987,1989 four-year district test, except in late 1987