  We point out that high-mass thresholds in the evolution of the
strong-interaction coupling parameter $\alpha_s$, due to gluinos, squarks and
possible new heavy quarks, could introduce appreciable corrections to the
transverse momentum dependence of jet production at the Tevatron. If the new
thresholds were near scale $\mu = 200$~GeV, then within the limits of
asymptotic freedom they could introduce up to $11\%$ increase in
$\alpha_s(\mu)$ (and hence $23\%$ increase in jet production) at scale
$\mu=500$ GeV, compared to Standard Model extrapolations.
