Etim, I., I. Ahuchaogu, and A. I. Etuk. “Tillage Methods to Determine Soil Infiltration Rates: A Case Study in Uyo, Nigeria”. Agriculture and Food Sciences Research, vol. 2, no. 2, July 2015, pp. 43-50, http://www.asianonlinejournals.com/index.php/AESR/article/view/177.