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*Keisuke Katsura
Experimental Farm, Kyoto University
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Masato Oda
Japan International Research Center for Agricultural Sciences
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Ken-ichi Matsushima
National Agriculture and Food Research Organization
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Inusah Baba
Savanna Agricultural Research Institute
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Dogbe Wilson
Savanna Agricultural Research Institute
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Jun-Ichi Sakagami
Faculty of Agriculture, Kagoshima University