Rochana Tangkoonboribun และ Sawaeng Ruaysoongnern. (2006) Effects of organic and clay material amendments on sugarcane production in a degraded sandy soil of Northeast Thailand. Khon Kaen University:ม.ป.ท.Rochana Tangkoonboribun และ Sawaeng Ruaysoongnern. 2006. Effects of organic and clay material amendments on sugarcane production in a degraded sandy soil of Northeast Thailand. ม.ป.ท.:Khon Kaen University;Rochana Tangkoonboribun และ Sawaeng Ruaysoongnern. Effects of organic and clay material amendments on sugarcane production in a degraded sandy soil of Northeast Thailand. ม.ป.ท.:Khon Kaen University, 2006. Print.