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{\large\bf\boldmath Test of QCD Dynamics at Small Parton Momenta $x$ at HERA
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{H1 Collaboration}\\                            
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{\small \em DESY, Hamburg, Germany}\\[6mm]
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The production of high transverse momentum $\pi^0$'s and
charged particles is studied in deep inelastic positron-proton scattering
data taken with the H1 detector at the $ep$ collider HERA. The rate of
 particles observed at small angles with respect to the initial proton
direction is strongly correlated to the underlying parton dynamics.
Results are
presented as a function of Bjorken-$x$ and $x_i$, the fraction of the
incident proton's energy carried by the particle. The data are
analysed in a region of low Bjorken-$x$ and large $x_i$ and are compared
with the predictions of BFKL calculations at leading order and with QCD
based  Monte Carlo models.

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