Variation in oxalate content among corm parts, harvest time, and cultivars of taro (Colocasia esculenta (L.) Schott)

•The distribution of oxalates in taro corms depends on corm part.•The majority of water-soluble oxalates accumulate in central and lower corm parts.•Insoluble oxalates prevail in marginal parts.•Water-soluble oxalates increase with the length of growth period.•The lowest content of total oxalates and Ca is reached at full maturity.