  We study the effects of an attractive three body interaction potential on a
spin-1 ultracold Bose gas using mean field approach (MFA). For an
antiferromagnetic (AF) interaction, the third MI lobe is predominantly
affected, where it completely engulfs the second and the fourth MI lobes at
large values of the interaction strength. Albeit no significant change is
observed beyond the fourth MI lobe. The formation of the spin singlet (nematic)
MI phase and the different order of phase transitions to the SF phase have been
carefully scrutinized with the help of spin eigenvalues and spin nematic order
parameter. In the ferromagnetic case, the phase diagram shows similar features
as that of a scalar Bose gas. We have compared our results on the MFA phase
diagrams for both types of the interaction potential via a perturbation
expansion in both the cases.
