近几年来，由于杂交棉“皖杂４０”增产显著，种植面积迅速扩大，社会效益猛增，促进了我省棉花生产的发展。但有些棉农对杂交棉缺乏足够的认识，认为自己种的杂交棉（二代）种子不错，为省下买种钱，以老习惯自留种（三代）备用，结果达不到预期的增产目的，甚至造成严重减产 In recent years, due to hybrid cotton “Wanza 40” significant increase in production, planting area expanded rapidly, social benefits soared, and promote the development of cotton production in our province. However, some cotton farmers do not have enough understanding of hybrid cotton and think that they have good seeds for hybrid cotton (second generation). In order to save money for purchasing seeds and reserve for the old habit (three generations), they fail to achieve the expected increase in yield , Even causing serious cuts