Sriket, S. , Thanachit , S. และ Anusontpornperm, S. 2015. Effect of fertilizer rates on cassava grown on Yasothon soil amended with cassava stem base biochar and wastes from cassava starch manufacturing plant. วารสารแก่นเกษตร. 43, 4 (ธ.ค. 2015), 755–762.