The empirical Eq. (1) fit well to relate draft and wheel slip on tilled land with a very high coefficient of determination (R2) varying 0.98–0.99 at 2000 rpm. The equation is valid for draft values between 582 and 1080 N in second low and 650–1057 N in third low gear at 2000 rpm. The values of the draft obtained at 25% wheel slip and rated speed (i.e., 2000 rpm) were 803 and 773 N in second low and third low gears, respectively.