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Hiroyuki KOSHINO
Department of Agricultural Chemistry, Faculty of Agriculture, Hokkaido University
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Teruhiko YOSHIHARA
Department of Agricultural Chemistry, Faculty of Agriculture, Hokkaido University
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Sadao SAKAMURA
Department of Agricultural Chemistry, Faculty of Agriculture, Hokkaido University
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Tadayuki SHIMANUKI
National Grassland Research Institute
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Tohru SATO
National Grassland Research Institute
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Akitoshi TAJIMI
Hokkaido National Agricultural Experiment Station