Aboveground- tree biomass, some of the wood properties  and chemical compositions of stem wood ash were measured in five ages (2, 5, 7, 15 and 25- year- old) of Dalbergia sissoo trees, growing on infertile soil in the Tropical Farm, Kom- Ombo, Aswan Botanical Garden  (southern Egypt).  There were twenty- four trees for each age planted as a single row and the distance between trees was 5 m. Asexpected, biomass and its compartment of Dalbergia sissoo at the 25- year- old had the highest values in compared to the other ages. The mean aboveground biomass in this study was about 60.53 kg, 203.7 kg, 591.6 kg, 1210.5 kg and 3060.3 kg/ tree for the 2, 5, 7, 15 and 25- year- old of Dalbergia sissoo trees, respectively. Casual observation of the curve for trees shows consistent increase in the total biomass, height and diameter growth with tree age. Wood specific gravity was increased with the progress in tree age, while moisture content decreased with the increase in age. However, the percent of heartwood to sapwood was gradually increased from the young tree to the age tree.  On the other hand, in most cases, nutrient accumulation in the stem wood ashes was gradually increased by the increasing in the tree age.