  We compute by numerical integration of the Dirac equation the number of
quark-antiquark pairs produced in the classical color fields of colliding
ultrarelativistic nuclei. The backreaction of the created pairs on the color
fields is not taken into account. While the number of qqbar pairs is
parametrically suppressed in the coupling constant, we find that in this
classical field model it could even be compatible with the thermal ratio to the
number of gluons. After isotropization one could thus have quark-gluon plasma
in chemical equilibrium.
