德阳市中区常年种植大麦10万亩左右,亩产长期徘徊在500斤上下。其主要原因是:当家品种(早熟3号)随着种植年代延长,机械混杂严重和种性退化。据84、85年调查,严重混杂的面积占该品种的90%。混杂株占12%以上。而且杆子韧性减弱。倒伏严重。穗子变小、千粒重降低。在一定程度 Deyang City, perennial planting about 10 acres of barley, long-term hovering in 500 pounds per mu. The main reason for this is that when the variety (precocious No. 3) is prolonged with planting, the machinery is mixed seriously and the species is degenerated. According to the survey of 84 and 85 years, serious mixed area accounts for 90% of the breed. Mixed strains account for more than 12%. And the pole toughness weakened. Lost serious. Ear smaller, reduced grain weight. To a certain extent