Bhop Burapatpong และ Ed Sarobol. (2013) Effects of ethephon and cow dung in combination with chemical fertilizer application on growth and yield of corn. Kasetsart University:ม.ป.ท.Bhop Burapatpong และ Ed Sarobol. 2013. Effects of ethephon and cow dung in combination with chemical fertilizer application on growth and yield of corn. ม.ป.ท.:Kasetsart University;Bhop Burapatpong และ Ed Sarobol. Effects of ethephon and cow dung in combination with chemical fertilizer application on growth and yield of corn. ม.ป.ท.:Kasetsart University, 2013. Print.