  Experimental data from the Tien Shan complex array on different components of
extensive air showers at 0.5-10 PeV primary cosmic rays are compared with
results of various calculated models of cosmic rays interactions at the
atmosphere. Conclusion is made about the growth with energy of the inelastic
proton-air cross section {\sigma}p-air from 0.2 TeV (accelerator experiments
with fixed targets) to 10 PeV (cosmic rays). The analysis showed that the rise
conforms to (7-9)% per one order of energy. That corresponds to {\sigma}p-air
(1 PeV) = 350 mb. These data correspond better to the new QGSJET-II-04 version
of the interaction model based on the recent LHC results. This model predicts
better the slower rise of the cross section than previous versions of QGSJET-II
and some other models.
