Donjadee, Somchai, and Tawatchai Tingsanchali. 2016. “Soil and Water Conservation on Steep Slopes by Mulching Using Rice Straw and Vetiver Grass Clippings”. Agriculture and Natural Resources 50 (1). Bangkok, Thailand:75-79. https://li01.tci-thaijo.org/index.php/anres/article/view/243887.