Biomass production is one of the main conditional factors of tuber quality. Thus, the cultivars were grouped into three classes according to tuber dry mass: high dry mass content (more than 20 %), being appropriate for potato chip production; intermediate content (between 18 to 19%), suitable for mashed potato and low content (less than 17.9 %), suitable for salads. According to this classification, Atlantic cultivar can be included in the first group, while Agata and Bintje were included in the third group, as reported by Feltran et al. (2004).