KHAMWICHIT, W., SANONGRAJ, W. and SANONGRAJ, S. (2011) “Study of Environmental Impacts Before and After Using the Organic-Chemical Fertilizer in Rice Paddy Fields”, Walailak Journal of Science and Technology (WJST), 3(1), pp. 51–68. Available at: https://wjst.wu.ac.th/index.php/wjst/article/view/149 (Accessed: 30April2024).