he response of three timber tree species of Azadirachta indica, Khaya ivorensis and K. senegalensis (6-year- old) grown on loamy sand soil to different NPK- fertilization levels were studied during 2008 and 2009 seasons at the Tropical Farm, Kom- Ombo, Aswan, Egypt. Levels of N, P and K in the fertilizer mixtures were variables as N 30, 45 and 60; P 20, 35 and 50; and K 20, 30 and 40 g and influenced the growth parameters of the tree. Chemical analysis showed that the highest foliar concentrations of P and K were obtained by fertilizing with N 45- P 35- K 30 g/tree. These amounts were divided into three equal doses added at August, September and October during both seasons. Data obtained showed that the mixture of N 45- P 20- K 40 g/tree produced the longest and thickest stems. The maximum N content in leaves was obtained by applying N 60- P 20- K 20 g/ tree. Concerning the effect of NPK- fertilization on wood specific gravity of the three woody tree species, all fertilization levels resulted in significant increase in this parameter, while the mixture of N 45- P 20 – K 40 g/ tree was more effective in respect of wood specific gravity.