Debele, Tadesse, and Birhanu Iticha. 2017. “Effects of Drain Depth of Vertisols, Nitrogen Source and Time of Application on Nutrient Uptake by Maize (Zea Mays L.) in Western Ethiopia”. International Journal of Agricultural Research, Innovation and Technology 7 (1):1-7. https://doi.org/10.3329/ijarit.v7i1.33314.