  We have investigated the $R$-ion ($R$ = rare earth or Y) size variance effect
on spin/orbital order in Eu$_{1-x}$(La$_{0.254}$Y$_{0.746}$)$_{x}$VO$_3$. The
size variance disturbs one-dimensional orbital correlation in $C$-type
spin/$G$-type orbital ordered states and suppresses this spin/orbital order. In
contrast, it stabilizes the other spin/orbital order. The results of neutron
and resonant X-ray scattering denote that in the other ordered phase, the
spin/orbital patterns are $G$-type/$C$-type, respectively.
