Kemal, Y. O. ., and M. . Abera. “Contribution of Integrated Nutrient Management Practices for Sustainable Crop Productivity, Nutrient Uptake and Soil Nutrient Status in Maize Based Cropping Systems”. Journal of Nutrients, vol. 2, no. 1, Mar. 2015, pp. 1-10, doi:10.18488/journal.87/2015.2.1/87.1.1.10.