  We study the Blume-Capel model on the square lattice. To allow for wetting
and interfacial adsorption, the spins on opposite boundaries are fixed in two
different states, "+1" and "-1", with reduced couplings at one of the
boundaries. Using mainly Monte Carlo techniques, of Metropolis and Wang-Landau
type, phase diagrams showing bulk and wetting transitions are determined. The
role of the non-boundary state, "0", adsorbed preferably at the interface
between "-1" and "+1" rich regions, is elucidated.
