  A model for the total photoproduction cross section based on the ansatz that
resummation of infrared gluons limits the rise induced by QCD minijets in all
the total cross-sections, is used to simulate extended air showers initiated by
cosmic rays with the AIRES simulation program. The impact on common shower
observables, especially those related with muon production, is analysed and
compared with the corresponding results obtained with previous photoproduction
models.
