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退化就是指品种的特征特性(即遗传性)发生了不利于栽培、不利于生产的改变。混杂就是一个品种中混入了其它品种。混杂必然导致退化,退化必然导致混杂。因此,通常用混杂退化来说明品种生活力的减退。1989、1990年我们的调查表明,一般谷子大田用种的杂株率为7.8％～16.7％,白发病、红叶病分别增加1.3和1.7个百分点,株高降低9.0厘米,穗长缩短5.4厘米,穗粒重减少10.3克,比原种平均减产6.9％～11.0％。
Degradation refers to the characteristics of varieties (ie, genetic) occurred in the adverse of cultivation, is not conducive to production changes. Mixed is a variety mixed with other varieties. Mixed inevitably lead to degradation, degradation will inevitably lead to mixed. Therefore, mixed degradation is usually used to illustrate the decline of breed viability. In 1989 and 1990, our survey showed that the average rate of miscellaneous plants for millet field was 7.8% ~ 16.7%, white and red leaf diseases increased by 1.3 and 1.7 percentage points respectively, the plant height was reduced by 9.0 cm, the spike length was shortened by 5.4 cm, Ear weight decreased 10.3 grams, an average reduction of 6.9% to 11.0% over the original species.