在全世界范围內,馬鈴薯的大量生产都限于冷凉地区,其限制因素首先是种薯的退化。种薯退化現象也在較輕微的程度上发生于大部分的馬鈴薯产区。对于馬鈴薯种性退化的原因曾經进行了长期的爭論。根据我們从一九五三年以来累积的研究資料,可以肯定馬鈴薯的退化不是单純由于高温或病毒侵染所引起的,而是馬鈴薯在不适宜的土壤条 Worldwide, mass production of potatoes is limited to cool areas, the limiting factor being primarily the degradation of seed potatoes. Degradation of seed potatoes also occurs to a lesser degree in most potato producing areas. There have been longstanding debates about why potatoes degenerate. Based on the research data that we have accumulated since 1953, we can affirm that the degradation of potato is not simply caused by high temperature or virus infection, but rather that the potato is degraded in unsuitable soil