根据分蘖力和穗粒重,常把水稻品种分为穗数型、穗重型和中间型。各类型之间不但形态差异很大,而且“源”和“库”的结构也不相同。解放初,生产上所用的水稻品种多为古老的农家种,在植株性状方面均属高秆、少蘖、大穗型。从六十年代起,全国不少地区推广矮秆多穗型品种,使水稻产量大幅度提高,我省中北部推广中间型品种产量也有所增加。由于穗数型品种再靠增加穗数来提高单从将有一定困难,近年来不少育种工作者提出选育穗重型或大粒型品种。除了增强抗逆力(多抗性)外,究竟选 According to tillering power and grain weight, rice varieties are often divided into spike number, spike weight and intermediate type. Not only the forms vary greatly among different types, but also the structures of “source” and “library” are not the same. At the beginning of the liberation, most of the rice varieties used in production were mostly old farm families, all of which were tall stalks, few tillers and large spikes in plant traits. Since the 1960s, dwarf and multi-spike varieties have been promoted in many parts of the country, resulting in a substantial increase in rice production. The output of intermediate varieties for promotion in central and northern part of our province has also increased. In recent years, many breeders have proposed to select or breed heavy or large grain varieties due to the increased number of spikes to increase the number of spikes alone will have some difficulties. In addition to enhancing the resilience (multi-resistance), the election