Palakit, K., K. Duangsathaporn, P. Lumyai, N. Sangram, P. Sikareepaisarn, and C. Khantawan. “Efficiency of Biochar and Bio-Fertilizers Derived from Maize Debris As Soil Amendments”. Environment and Natural Resources Journal, vol. 16, no. 2, June 2018, pp. 79-90, https://ph02.tci-thaijo.org/index.php/ennrj/article/view/129060.