Over the years, different kinds of tillage operations and implements have evolved in order to give the soil the best tilt for crop production. Tillage is an inevitable part of soil management and crop production. A good tillage
operation should provide a suitable soil pulverisation. Ridging is a tillage operation intended for heaping up of tilled soil from two sides to form long stripes of mounds having furrows in between. Mechanised ridging is always done after ploughing and harrowing operations(Nkakini et al.,2008). This tillage operation is accomplished with the aid of tillage implement called disc ridger. Until recently, one of the challenges in design of agricultural field tractor had been to equip it with a tractive device that can develop effective traction with minimum soil damage(Hassan and Broughton, 1975). Over time, the choice of tractive elements used for off-road vehicles to generate tractive force was mainly restricted to pneumatic tyres(Yu,2006).
A tractor pulling a tillage implement through the soil must overcome the draught force which is generated by the traction between the tyres and the soil surface. Tractive force plays a vital role in tillage operations, therefore the need to determined the appropriate tractive force model becomes necessary in order to balance the variables in operations. However, establishing the required tractive force is a complex phenomenon as evident from numerous efforts made to develop appropriate model that characterized the operations. Different modeling tools such as empirical, analytical and numerical analysis have