优良的亚麻种子是保证亚麻高产高效不可缺少的生产资料。实践证明,每更新一次良种品种,对亚麻产量就有一定程度的提高,而在生产过程中由于环境条件,耕作栽培水平的变化,造成品种纯度的变化。为了保证品种纯度,延长使用年限,为生产源源不断的提供原种,充分发挥良种的增产作用,对生产上推广应用的新品种就必须进行提纯复壮确保种子纯度和优良种性。优良品种不是固定不变的,一个优良品种在生产过程中,不注意防杂保纯,就会由纯变杂,由优变劣,给良种在生产中的增产作用会逐年下降,从生产实践中看,良种退化的主要原因是:一是机械混杂;二是物学混杂;三是品种自身的变化和环境条件的影响;四是选种中的人为作用等造成品种混杂退化。为保证品种纯 Excellent flaxseed is an indispensable means of production to ensure the high yield and high efficiency of flax. Practice has proved that, every time a new breed of varieties of flax yield to a certain extent, while in the production process due to environmental conditions, farming and cultivation level changes, resulting in changes in species purity. In order to ensure variety purity, extend the useful life, provide an endless stream of raw materials for production, give full play to the role of improved seed production, promote the production of new varieties must be purified and rejuvenated to ensure the seed purity and superior species. Good varieties are not fixed, a good variety in the production process, do not pay attention to anti-hybrid pure, it will be pure change miscellaneous, by the superior and inferior, to the improved seed production in the role of production will decline year by year, from the production practice In the view, the main reason for the degeneration of the elite is: First, mechanical hybrid; second is the mixture of things; Third, the variety of their own changes and the impact of environmental conditions; Fourth, the anthropogenic effects caused by species selection hybrid degeneration. To ensure breed pure