Sutisa Pinitpaitoon และ Amnat Suwanarit. (2012) Enhancing productivity of red clay soil for maize cropping by organic fertilizer application in combination with mineral fertilizers. Kasetsart University,:ม.ป.ท.Sutisa Pinitpaitoon และ Amnat Suwanarit. 2012. Enhancing productivity of red clay soil for maize cropping by organic fertilizer application in combination with mineral fertilizers. ม.ป.ท.:Kasetsart University,;Sutisa Pinitpaitoon และ Amnat Suwanarit. Enhancing productivity of red clay soil for maize cropping by organic fertilizer application in combination with mineral fertilizers. ม.ป.ท.:Kasetsart University, 2012. Print.