Research Article
Effect of Earthworm Activities (Pheretema sp.) on the Changes in Soil Chemical Properties at Different Soil Depths of Nampong Soil Series (Ustoxic Quartzipsamment) in Northeast Thailand
Department of Land Resources and Environment, Faculty of Agriculture, Khan Kaen University, Khan Kaen 40002, Thailand
S. Ruaysoongnern
Department of Land Resources and Environment, Faculty of Agriculture, Khan Kaen University, Khan Kaen 40002, Thailand
T. Chuasavathi
Department of Land Resources and Environment, Faculty of Agriculture, Khan Kaen University, Khan Kaen 40002, Thailand