近年来,随着农业科学技术的进步,优良品种在作物增产中的作用越来越明显:一是可以显著增加产量,二是可以改进作物品质,三是可以减少病虫灾害所造成的损失,四是可以扩大作物种植面积和提高复种指数。 作物优良品种是在一定的生态条件下,根据农业生产的需要,人工选择、培育而成的作物群体。这个群体的遗传性比较稳定,形态特征和 In recent years, with the advancement of agricultural science and technology, the role of fine varieties in increasing crop yield has become more and more obvious. The first is that it can significantly increase the yield, the second is to improve crop quality, the third is to reduce the losses caused by pest and disease disasters, Fourth, it is possible to expand crop acreage and improve cropping index. Crop varieties are under certain ecological conditions, according to the needs of agricultural production, artificial selection, cultivation of crop groups. The heritability of this group is relatively stable, morphological characteristics and