洋芋种薯退化是当前生产中存在的一个较普遍的问题。在我省温暖地区,一般要从高寒地区换种薯来种。并且往往是换来的种薯第一年产量高,第二年产量常下降四分之一到三分之一,第三年的收成则仅有一半左右。因此,每年春季洋芋播种季节,必需组织大量的劳力和运输工具向外地高寒山区换种,给社、队的人力、物力、财力及国家交通运输均造成一定的困难,也影响了洋芋产量的进一步提高。洋芋喜凉爽的气候,忌高温炎热。据一些学者研究,洋芋块茎发育的最适温度是 Potato seed potato degradation is present in the production of a more common problem. In the warm areas of our province, we generally need to change potatoes from alpine areas. And in the first year, the yield of the seedbeds, often in return, is high, the output in the second year often falls by one fourth to one third and that in the third year is only about half. Therefore, in the spring seeding season of spring planting, a great deal of labor and means of transport must be organized to change fields to the alpine mountainous areas, which has caused certain difficulties to the social, material, financial and national transportation as well as the yield of potato improve. Joy like cool climate, avoid hot and hot. According to some scholars, the optimum temperature for tuber development is