## 3 Results and Discussion
### Dependence of Fuel Consumption on Variety of Tine Types and Working Speed  
The hourly fuel consumption depends on the tractor draft force which required to pull an implement [25]. Draft force depends on adjustments of implementing and working speed as accessible tillage level, and it defined as tractor drawbar resistance [27]. Various tillage system scenarios for soil tramline's renovation quality level were obtained by changing the tine shape type and working speed. It was found that adjustments that request to obtain the desirable level of soil renovation influenced the hourly fuel consumption from 7.9 to 17 L\(\cdot\)h\({}^{-1}\) (Figures 10 and 11). The fuel consumption was higher on clay loam than on loam soil by using the same working adjustment, due to greater compression hardening of clay loam soil.  
Figure 11: Dependence of hourly fuel consumption on speed and tine types on clay loam soil.  
Figure 10: Dependence of hourly fuel consumption on speed and tine types on loam.  
The results of performed experiment showed, that the hourly fuel consumption depends more on working speed, than on tine types, which explains that movement of tractor itself requires higher fuel content and more energy is needed to overcome inertial soil forces. It was found that hourly fuel consumption has direct relation with tillage resistance level and soil type: on clay loam it was 1.5-2.5 L h-h higher than on loam soil. When the speed was increased from 1.6 to 3.6 m s-1, the hourly fuel consumption in loam soil increased from 7.9 to 14.5 L h-h, and on clay loam soil--from 9.3 to 17.0 L h-h independent of type shape. Hourly fuel consumption was increased from 14.1 to 17.0 L h-h when winged shape was changed to narrow tines shape type on clay loam at maximum working speed (3.6 m s-1) and from 9.3 to 10.5 L h-h at minimum speed (1.6 m s-1). When the shape was settled from winged to narrow, the hourly fuel consumption increased 1.0-1.3 L h-1 on loam soil, and 1.2-2.9 L h-h on clay loam.  
The efficiency of tractor fuel use is better reflected in fuel consumption of soil tillage per hectare, but in this case, it was calculated for the tramline's tillage length (L-km-1). Fuel consumption per hectare is possible to count only approximately because width track lines are different, it depends on the spraying width of crop care machines, usually the fields are irregular shapes; for example, if the spraying width is 20 m, then 10 ha field has 5 km of tramlines, plus tramlines at the ends of fields. Fuel consumption per 1 km length of tramline tillage depends on working speed and type shape, it increases when winged shape was changed to narrow type but decreases with increasing the working speed.  
The results illustrate the possibility of restoring the tramlines on loam soil with fuel consumption from 1.04 to 1.54 L-km-1, on clay loam soil--from 1.15 to 1.82 L-km-1, on dependence of selected tillage mode (Figures 12 and 13). The shape type's changing from winged to narrow increased the fuel consumption per 1 km length from 0.08 to 0.17 L-km-1 on loam soil and on clay loam soil--from 0.16 to 0.21 L-km-1. When the tillage speed was increased from 1.6 to 3.6 m s-1 by winged shape the fuel consumption decreased regarding 0.4-0.5 L-km-1, and nearly 0.3-0.4 L-km-1 by narrow shape on both loam and clay loam soils.  
Figure 12: Dependence of fuel consumption on speed and tine types on loam soil.