Farm tractors have different driving systems, including four-wheel drive and rear-wheel drive which are common
systems employed to conduct agricultural operations all over the world. The type of driving system influences
tractor wheel slip which is one of the most effective factors in soil compaction. Hence a series of experiments
were conducted using Goldoni 240 tractor to investigate the effects of tractor driving systems, including four-
wheel drive (4WD), rear-wheel drive (RWD), and front-wheel drive (FWD) at different travel speeds, soil
moistures, number of passes (1, 5, and 9), and soil textures (clay loam, loam, and sandy loam) at the depths of 10,
20, 30, and 40 cm. Increasing tractor wheel slip showed a significant effect on increasing soil compaction. The
lowest tractor wheel slip was occurred using the 4WD system, and by increasing travel speed in this system, soil
compaction decreased. Increasing tractor speed in the FWD system increased tractor wheel slip and soil
compaction. In addition, increasing soil moisture content resulted in an increase in soil compaction, and this
event was intense in fine soils like clay loam. It was found that adaptive neuro-fuzzy inference system (ANFIS)
higher potential to predict the effect of multiple input variables on soil compaction (R2 =0.99) than regression
method. According to the standard coefficients of regression models, depth, type of driving system, number of
passes, moisture content, texture, speed, and inflation pressure were the factors significantly influencing soil bulk
density, respectively.