  Ultra High Energy Cosmic Rays with energies above ~ 10^18 eV provide an
unique window to study hadronic interactions at energies well above those
achieved in the largest man-made accelerators. We argue that at those energies
string percolation may occur and play an important role on the description of
the induced Extensive Air Showers by enhancing strangeness and baryon
production. This leads to a significant increase of the muon content of the
cascade in agreement with recent data collected at UHECR experiments. In this
work, the effects of string percolation in hadronic interactions are
implemented in an EAS code and their impact on several shower observables is
evaluated and discussed.
