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R. M. Britez
Department of Soils, Federal University of Parana
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T. Watanabe
Graduate School of Agriculture, Hokkaido University
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C. B. Reissmann
Department of Soils, Federal University of Parana
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M. Osaki
Graduate School of Agriculture, Hokkaido University
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T. Tadano
Graduate School of Agriculture, Hokkaido University