A large class of control strategies relies on computation of the output gradient vector. Recently the concept of block partial derivatives (BPD) and the associated algebra have been introduced to facilitate the computation of the gradient vector in nonlinear systems. The derivation presented in that reference, however, cannot easily be applied to control plants with known structure. In this paper, we propose a simpler procedure for BPD computation. The proposed BPD computation procedure is then applied to derive MRAC schemes for Hammerstein plant. The choice of design parameters based on local stability are provided and results of simulation study are reported.