This work is devoted to a class of parabolic equations with a double nonlinearity whose representative is a model equation (| | −2) = ∑︁ =1 (| | −2) , ≥. .. ≥ 1 > , ∈ (1, 2). For the solution of Dirichlet initial boundary value problem in a cylindrical domain = (0, ∞) ×Ω, Ω ⊂ R , ≥ 2, with homogeneous Dirichlet boundary condition and compactly supported initial function, precise estimates the decay rate as → ∞ are established. Earlier these results were obtained by the authors for ≥ 2. The case ∈ (1, 2) differs by the method of constructing Galerkin approximations that for an isotropic model equation was proposed by E.R. Andriyanova and F.Kh. Mukminov.