  We report on some recent solutions of the Dyson-Schwinger equations for the
infrared behavior of the gluon propagator and coupling constant, discussing
their differences and proposing that these different behaviors can be tested
through hadronic phenomenology. We discuss which kind of phenomenological tests
can be applied to the gluon propagator and coupling constant, how sensitive
they are to the infrared region of momenta and what specific solution is
preferred by the experimental data.
