1. Fuel consumption some tractor mode3ls for ploughing operations in the sandy-loam soil of Nigeria at various speeds and ploughind depths;Adewoyin;Agric. Eng. Int. CIGR J.,2013
2. Comparative fielf evaluation of three models of a tractor;Ahaneku;J. Appl. Sci. Eng. Technol.,2009
3. Effect of plowing depth and soil moisture content on reduced secondary tillage;Ahmadi;Agric. Eng. Int. CIGR EJournal,2009
4. Effect of ploughing depth and speed on tractor fuel consumption in a sandy-loam soil of Oyo State-Nigeria;Ajav;J. Agric. Eng. Technol. (JAET),2012
5. Effect of ploughing depth of tillage and forward speed on the performance of a medium size chiesel plow operating in a sandy soil;Al-Suhaibani;Am. J. Agric. Biol. Sci.,2010