Fig. 3. Cluster analysis of 14 environments in Peru in multidimensional space of storage root yield for seven clones of sweetpotato. OXA = Oxapampa, SRA = San Ramon, AQP = Arequipa, LMO = La Molina, TIM = Tingo Maria, TAC = Tacna, HCO = Huanuco. Nitrogen fertilization: N0 = 0 and N80 = 80 kg ha^–1.