by Vichai Sriboonlue(Khon Kaen University, Khon Kaen (Thailand). Faculty of Technology. Groundwater Research Center), Patma Vityakon(Khon Kaen University, Khon Kaen (Thailand). Faculty of Agriculture. Department of Land Resources and Environment), Natchaya Khetkratok(Khon Kaen University, Khon Kaen (Thailand). Faculty of Technology. Groundwater Research Center)
Published in Khon Kaen Agricultural Journal (Thailand) (01.10.2004)