坝上的胡麻生产,长期存在着严重的种间、品种间混杂退化问题,据调查一般减产15％左右。混杂退化的原因:一是胡麻天然杂交率高,一般为3％,高的达11％。二是人为机械混杂和品种多乱杂。目前推广的四九、匈牙利三号、坝亚一号、二号、雁农一号等品种,混有菜籽、臭芥达5—15％,品种间混杂也在10％左右,严重的达40％以上。 Flax production on the dam has long been a serious problem of inter-species and inter-species degeneration. According to the survey, a general reduction of about 15% is expected. Reasons for mixed degeneration: First, flax natural hybridization rate is high, usually 3%, up to 11%. Second, human-mechanical hybrid and breed more mixed. The current promotion of 49, Hungary, No. 3, one of Pakistan, No. 2, Yannong No. 1 and other varieties, mixed with rapeseed, smelly mustard 5-15%, the variety is also mixed between about 10% of the serious 40% or more.