Lina, S. B.; Maranguit, D. S.; Asio, V. B.; Sabijon, J. R.; Demain, K. L. B.; Bolledo, A. B. Growth Performance of Corn As Influenced by the Combined Application of Organic and Inorganic Fertilizers in a Marginal Upland Soil. Ann. Trop. Res 2014, 36, 16-29.