Fragmentation functions for quarks and diquarks in the model of quark-gluon strings

Fragmentation functions of different quarks and diquarks into hadrons are considered in the framework of the quark-gluon string model, based on the topological (1/N)-expansion. Rehaviour of the fragmentation functions is determined. It is expressed in terms of the intercepts of the well known Regge-trajectories. A theoretical estimate for the suppression of the heavy quarks (s, c, b...) production is obtained. Interpolation formulae for the fragmentation functions which satisfy all the conservation laws are derived