  The inclusive distributions of gluons and pions are calculated with absolute
normalization for high-energy nucleon-nucleon collisions. The results for
several unintegrated gluon distributions from the literature are compared. The
gluon distribution proposed recently by Kharzeev and Levin based on the idea of
gluon saturation is tested against DIS data from HERA. We find huge differences
in both rapidity and transverse momentum distributions of gluons and pions in
nucleon-nucleon collisions for different models of unintegrated gluon
distributions. The approximations used recently in the literature are
discussed. The Karzeev-Levin gluon distribution gives extremely good
description of momentum distribution of charged hadrons at midrapidities.
Contrary to a recent claim in the literature, we find that the gluonic
mechanism discussed does not describe the inclusive spectra of charged
particles in the fragmentation region, i.e. in the region of large $|y|$ for
any unintegrated gluon distribution from the literature.
