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*Takahiro Sakamoto
Graduate Sch. Biores. Bioenviron. Sci., Kyushu University
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Garba Bala
International Institute of Tropical Agriculture (IITA), Kano Station, Nigeria
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Ousmane Boukar
International Institute of Tropical Agriculture (IITA), Kano Station, Nigeria
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Takashi Yuasa
Faculty of Agriculture, Kyushu University
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Mari Iwaya-Inoue
Faculty of Agriculture, Kyushu University
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Satoru Muranaka
International Institute of Tropical Agriculture (IITA), Kano Station, Nigeria