马铃薯的主要经济产物为地下块茎。它不仅具有植株生理熟期的差异,同时也存在着地下块茎形成的早晚和膨大速度快慢的差异。多年来,早熟马铃薯品种选育方法,一般采用早熟杂交组合实生苗与无性系的选择。第二年开始在无性繁殖系中,再选择植株生理熟期早(主要是根据茎叶枯黄早)的优良 The main economic product of potatoes is underground tubers. It not only has the difference of physiological ripening period of plants, but also has the difference of the speed of tuber formation and enlargement speed of underground. Over the years, early maturing potato varieties breeding methods, the general use of early maturing hybrid combinations of seedlings and clonal selection. The second year began in the asexual reproduction line, and then choose the plant physiology ripe early (mainly based on stem and leaves withered early) excellent