随着农村生产责任制的建立和完善,优良品种的增产作用愈来愈引起了广大社员的重视。但是,由于盲目引种和机械混杂造成的品种退化问题也愈来愈严重。据不完全统计,我县小麦品种有二十几个,棉花品种十几个,其中有一部分是社队不经种子系统,盲目从外地引进的。如引进的鲁棉1号棉种,破、虫、小、秕子多,霜后子多,发芽率仅在40-80％,造成了大面积的缺苗断垄。小麦品种更杂,一户一个品种,有的户 With the establishment and improvement of rural production responsibility system, the increasing role of fine varieties has drawn more and more attention from the majority of members. However, the problem of species degradation due to blind introduction and mechanical mixing is also getting worse. According to incomplete statistics, there are more than 20 wheat varieties and more than 10 varieties of cotton in our county. Some of them are blindly imported from other places without the seed system. Such as the introduction of Lumi Cotton No. 1, broken, insects, small, prickly heat and more after the cream, the germination rate of only 40-80%, resulting in a large area of ​​missing seedlings off ridge. More variety of wheat varieties, a variety of households, some households