Deng, Biar, Bolajoko Bada, Priit Tammeorg, Juha Helenius, Olavi Luukkanen, and Mike Starr. 2019. “Drought stress and Acacia seyal biochar effects on sorghum gas exchange and yield: A greenhouse experiment”. Agriculture and Natural Resources 53 (6). Bangkok, Thailand:573–580. https://li01.tci-thaijo.org/index.php/anres/article/view/232629.