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to results of soil and groundwater investigations
Hiromasa HAMADA*, Toshitsugu MOROIZUMI** and Nongluck SUPHANCHAIMAT**** Japan International Research Center for Agricultural Sciences,+ῌ+, Ohwashi, Tsukuba, Ibaraki, -*/ῌ2020 Japan** Okayama University, -ῌ+ῌ+, Tsushima-naka, Okayama, 1**ῌ2/-* Japan*** Khon Kaen University, Khon Kaen .***,, ThailandAB ))

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