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Takashi TASHIRO
Ogata Research Group of Direct Seeding of Rice
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Osamu SUGAWARA
Ogata Experimental Farm, Akita Agricultural Experiment Station
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Takeshi OTA
Ogata Experimental Farm, Akita Agricultural Experiment Station
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Hiroshi NAGANOMA
National Agricultural Research Center
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Masahiko SAIGUSA
Experimental Farm of Tohoku University