Breeders at the Genetic and Crop Improvement Global Program (GCI) know that breeding clones must be suited to the cropping systems and length of the potato growing season of a particular region within their agro-ecological area of adaptation. In this sense, tuber bulking information of clones is of great interest for recommending testing toward final adoption. This information is valuable for assessing performance and adaptation particularly in areas with short growing seasons, where harvesting has to be performed during the bulking period, that is, before top (leaf) senescence.