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*Corresponding author: Takeshi Nagai,Graduate School of Agricultural Sciences, Yamagata University, Yamagata 9978555, Japan. E-mail: nagatakenagatake@yahoo.co.jp, tnagai@tds1.tr.yamagata-u.ac.jp Received: 20 December 2018 ; Accepted: 12 February 2019 R E S E A R C H A R T I C L E

Potentials of representative heirloom vegetables on Shonai region of Yamagata, Japan