  A measurement of the inclusive cross-section for the photoproduction of
protons in the central fragmentation region at HERA is presented. The measured
cross-section is compared with the prediction of the PYTHIA MC model. The
obtained value of the diquark suppression factor in the Lund string model is
different from that obtained in e+e- data. The dependence of the cross-section
as a function of the transverse mass M_T is shown to be similar for different
hadrons produced in photoproduction at HERA.
