This study was conducted in the province of Nineveh to evaluate the performance of the farm tractor by potato farmers in terms of the exploitation of the power available and stand on the field practice used and lead to the wasting of energy were done by measuring the energy indicators of actual disbursements in the operations of tillage, smoothing and Agriculture for the crop and compare them with what is possible and the ideal and calculated according to measurements recommended by the world in order to find out the efficiency of use of each of the indicators studied and their impact on the productivity and efficiency of the machinery unit and time of completion of field operations for the unity of space and energy consumption per area unit. Showed the results to speed at the field operation utilized speed was increased (79.2%) , (55.38%) and (78.73%) of the speed possible for the operations of tillage, smoothing and agriculture respectively, and the draft force measured on a drawbar was (33.56% , 28.87% and 18.49%) of the draft force potential offered by the tractor-used for the operations tillage, smoothing and Agri- culture .Well the power utilized in the three operations were (26.58%, 15.99% and 14.56%) of the existing power respectively, the utilized supply workable for agricultural machinery of the three agricultural machinery moldboard plow, sweep and the two rows planter were increased (70.59% , 97.08% and 55.62%) of the show workable manner and can be calculated according to the general equation published within the data of the American Society of Agricultural Engineers (ASAE Standard; (2003)) respectively, decreased productivity of the group machinery was increased (55.91%, 53.76% and 39.36%) of the productivity potential of the three, respectively, and increased the perfect time required to complete the three field operations for the area unit were increased 47.5% of the verb time,while the consumption of fuel and field spend energy on the basis of unit area in excess of the consumption standard ideal, the value that provides mechanical power to the total area (1.98) kw/ha and the area under cultivation (24) kw/ha.