采用良种是小麦增产的重要措施之一,目前一些地方发生良种混杂、退化,丰产性能降低,失去了良种原有优良特性。据调查,混杂严重的田块杂麦在百分之二、三十。这是小麦生产上极应注意的问题。小麦良种发生混杂、退化的原因,一般是由于机械混杂,天然杂交和不良栽培管理所造成。从生物的生长发育规律来说,一个良种经过数代繁殖,本身处在不断的变化之中,有的植株变好了,有的变坏了,不可能长期稳定在一个水平上。解决良种混杂退化的有效办法, The use of seed is one of the important measures to increase wheat yield. At present, there are hybrids, degradation and high yield performance in some places, which have lost their original good characteristics. According to the survey, miscellaneous fields Tian malting wheat at 2 percent, thirty. This is the most important issue in wheat production. The reasons for the mixed and degenerated wheat seeds are generally caused by mechanical hybridization, natural hybridization and poor cultivation management. From the biological growth and development of law, after several generations of a breeding seed multiplication itself is in constant change, some plants get better, and some worse, it is impossible to long-term stability in a level. Effective solution to the problem of hybrid degeneration,