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种植良种是一项投资少、见效快、经济效益高的农业增产措施。一个优良品种,经过几年大面积种植后,常因机械混杂、品种杂交即产生分离等,而失去品种特性。特别是近几年,包干农户自己留种的越来越多,加上良种种类较多,管理不当,混杂现象更为严重。所以
Planting seeds is a less investment, quick, high economic efficiency of agricultural production measures. An excellent variety, after several years of planting a large area, often due to mechanical hybrids, hybrids that produce separation, etc., and lost variety characteristics. In recent years, in particular, more and more private farmers have left their own homes, with more types of thoroughbreds, improper management, and more mixed phenomena. and so