  In this work we study the indirect effects of squarks and gluinos via
supersymmetric QCD radiative corrections in the decays of Higgs particles
within the Minimal Supersymmetric Standard Model. We consider a heavy
supersymmetric spectrum and focus on the main nondecoupling effects. We propose
a set of observables that are sensitive to these corrections and that will be
accessible at the CERN Large Hadron Collider and Fermilab Tevatron. These
observables are the ratios of Higgs boson branching ratios into quarks divided
by the corresponding Higgs boson branching ratios into leptons, and both
theoretical and experimental uncertainties are expected to be minimized. We
show that these nondecoupling corrections are sizable for all the proposed
observables in the large $\tan\beta$ region and are highly correlated. A global
analysis of all these observables will allow the experiments to reach the
highest sensitivity to indirect supersymmetric signals.
