Puongmala, P., and J. Inthasan. “Fertilizer Management for Rice Varieties RD61 on Some Soil Chemical Properties In-Season and Off-Season”. Songklanakarin Journal of Plant Science, vol. 8, no. 2, Dec. 2021, pp. 79-87, https://www.sjplantscience.com/index.php/ojs/article/view/22.