  Neutral pion number fluctuations have been measured in proton interactions at
U-70 accelerator (IHEP, Protvino). The experiment is carried out on the SVD-2
setup. Charged and neutral particles are registered simultaneously. The
reconstruction of $\pi ^0$-mesons is fulfilled by means of observed gamma
quanta at the electromagnetic calorimeter. The corrections on the setup
acceptance, triggering, efficiencies of detectors and the reconstruction
algorithm are included. The multiplicity distributions of the neutral pions
have permitted to define the scaled variance, $\omega $, for $\pi ^0$-mesons.
The revealed sharp growth of fluctuations of the neutral pion number at total
meson multiplicities more than 22 can indicate the Bose-Einstein condensate
formation.
