  Sum rules are derived relating Dirac mean square radii and anomalous magnetic
moments of various couples of the ground state $1/2^+$ octet baryons with the
convergent integral of the difference of hadron photoproduction cross-sections
on the corresponding baryons. Taking into account the present knowledge of
static parameters of baryons a chain of inequalities for total hadronic
photoproduction cross-sections on baryons is found from those sum rules.
