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Chikako Miura
Akita Prefectural Agricultural Experiment Station
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Hayato Shindo
Akita Prefectural Agricultural Experiment Station
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Soichi Nakayama
National Agricultural Research Center for Tohoku Region
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Ken-ichi Hirakawa
Yuri Regional Affairs department Akita prefecture (present address: Agriculture Department Akita prefecture)
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Naoko Taguchi
Yamamoto Regional Affairs department Akita prefecture (present address:Senboku Regional Affairs department Akita prefecture)
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Hirohiko Morita
Akita Prefectural University