The effects of different levels of N and P fertilizers and their combinations on the histochemical properties of Gmelina arborea Roxb. seedlings on latosolic soil were investigated. Four levels (0.00, 9.50, 19.00 and 28.50 g/pot) of N and P were applied in all possible combinations. N was applied as calcium ammonium nitrate (Ca(NH4)2NO^ and P as superphosphate (Ca(H2POJ H2O). Equal doses of N and P (N2P2) produced the longest fibres. Application of N without P increased fibre diameter and fibre lumen size. All the treatments significantly increased fibre wallthickness in relation to the control. All the treatments reduced coefficient of suppleness and increased runkel ratio in comparison with the control Application ofP alone raised slenderness ratio. N alone did not produce any significant differences. The highest value was obtained with N2P2. Wood pH was reduced by all the treatments while alcohol benzene solubles, alkali (1 % NaOH) solubles, and hot water solubles were increased by fertilization. Holisticassessment of the treatments showed that fertilizing G. arborea seedlings on latosolic soil with N and P did not improve the histochemical properties relevant to pulp and paper production when compared with the control While the performances of most of the treatment combinations were homogeneous with the control, a few combinations performed significantly lower than the control The best treatment combinations were, however, obtained as N0P3 and N1PL