The following parameters are treated in this paper: tractive efficiency (ζv), coefficient of net traction (Φ_n) and the slip (δ) for tractors (4×2)S, (4×4)S and (4×4)Z for the substrates: concrete (Pl), dry lucerne-field (P2), stubblefield (P3), stripped soil (P4), soil prepared for sowing (P5) and freshly plouhhed soil (P6). Equations of exponential type and mean values of the parameters are defined in the paper.
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