1982年,我们对原榆次县6种主要作物约33.7万亩的品种纯度进行了调查(见表1)。表1所列6种作物优种面积基本普及,但品种纯度不高,优种不优现象严重。除“两杂”种子纯度达98肠的占80肠以上外,其余常规种子的纯度都很低.其主要原因是: 1.科研和推广脱节目前,一项科研成果 In 1982, we investigated the purity of about 337,000 mu of six major crops in Yuci County (Table 1). The six kinds of crops listed in Table 1 basically popularize the area, but the purity of varieties is not high. In addition to “two hybrid ” seed purity of more than 80 intestine accounted for more than 80 intestines, the purity of other conventional seeds are very low.The main reason is: 1 scientific research and promotion of disjunction before a scientific research