A comparison among different kinds of motors with evaluation of power requirements

Tractors have a large and effective role in agricultural works, and because Iraq is one of the large agricultural countries, so it was necessary to study the types of tractors that are used in performing these works and compare between them to show which one is better and preferable. The subject of the current research paper is based on a comparison, the comparison includes theoretical comparison among these tractors via the laws related to them and practical comparison that included studies conducted on two different types of capacity of tractors (4. D.W.)and (2. D.W.)at different times and conditions. It was determined through practical experience in the fields which tractors are best to work in terms of strength, traction capacity, rolling resistance and percentage of tire slip.