Tractor instrumentation, supervision and collection of variations of their working performance data, can considerably improve their efficiency. Implementing measurement systems on tractors has two main advantages: 1. It can improve the performance of the tractor by obtaining an optimum loading capacity according to the appropriate size of the devices and different working conditions of it (Changing the tractor’s gear) 2. It can also be useful in research works for estimating performance variables such as tractive and economic efficiency of tractors. In this research, a Messy-Ferguson 285 tractor is equipped with sensors to measure fuel consumption, engine speed, procession speed, tire slippage, and draft of implements. A GPS (global positioning system) receiver system is also installed on the tractor. In order to collect and display data from the sensors, a data acquisition system is utilized. Appropriate methods are used to calibrate the sensors and also a three-point hitch dynamometer. To perform field experiments, a piece of land (160m 24m) is meshed to (10m 3m) pieces and the soil strength is measured in 128 points by a penetro-meter. Soil humidity and texture is also obtained at these points. Next, the instrumented tractor is driven on the experiment field in 8 routes such that it moved on all the 128 points. Spatial variation maps of all the parameters are plotted using ILWIS and Surfer software programs. The path where the tractor is driven slowly is distinguishable by looking at the fuel consumption and draft force maps in view of the fact that energy consumption In the regions under the shadow of the trees where the soil
