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Bhanudacha Kamolmanit, Kanjana Thumanu, Nakhon Ratchasima, 30000, Thailand.), Phrueksa Lawongsa*(Department of Soil Science and Environment, Faculty of Agriculture, Khon Kaen University, Khon Kaen, 40002, Thailand, Saowalak Somboon(Department of Soil Science and Environment, Faculty of Agriculture, Khon Kaen University, Khon Kaen, 40002, Thailand, Soil Organic Matter Management Research Group, Khon Kaen University, Thailand), Weravart Namanusart
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