马铃薯夏播留种是解决种性退化的一种途径。所谓夏播留种,就是将头年收获的马铃薯贮藏到第二年夏季播种,秋收后留作下一年用种。这样的薯种性能好,退化轻,产量也高。以男爵品种为例,夏播留种的植株退化率为20％左右,比之黑龙江调来的种薯植株退化率还低。实践证明,夏播留种不但可以减轻或防止种性退化,而且还有复壮和恢复种性的效果。本溪地区马铃薯一般是春播夏收,这样就使整个生育期处于由低温到高温的变化过程,而块茎形成阶段,正 Summer sowing of potatoes is a solution to the degeneration of a way. The so-called summer sowing species, that is, the first year of harvest potato storage until the second year of summer sowing, harvest for the next year after harvest. Such potato kind of performance is good, light degradation, high yield. To baron varieties, for example, summer sowing plant degeneration rate of about 20%, compared with Heilongjiang transferred seed potato degeneration rate is still low. Practice has proved that summer sowing species can not only reduce or prevent species degeneration, but also rejuvenation and restoration of species effect. The potatoes in Benxi area are usually sowed in spring, so that the entire growth period is in the process of change from low temperature to high temperature, and tuberization stage, positive