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*Fumito Sasaki
Graduate School of Agriculture, Hokkaido Univ.
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Masaya Ota
Farm Tomita
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Yutaka Tamai
Graduate School of Agriculture, Hokkaido Univ.
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Toshizumi Miyamoto
Graduate School of Agriculture, Hokkaido Univ.
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Takashi Yajima
Graduate School of Agriculture, Hokkaido Univ.