A three-year field study was conducted to evaluate the effect of four leguminous tree species (Albizzia lebbek, Dalbergia sissoo, Prosopis cineraria and Vachellia nilotica) on soil physiochemical properties for soil fertility. The investigation was carried out utilizing a randomized complete block design, with four replicates per tree species. Results revealed significant differences between species and soil depth having profound effect on all soil properties analyzed. Interaction between species and soil depth was significant for pH and the interaction between species and soil depth was only significant for OC. Maximum soil pH was observed from 0-30 cm soil depths in all trees species. The highest soil pH 8.26 and soil moisture 19.72% was found in D. sissoo. At 0-15cm, maximum saturation percentage 36.77% was found in D. sissoo. EC content of the soils ranged from 2.31 mScm^-1 in V. nilotica at 15-30cm depth to 0.52 mScm^-1 in P. cineraria at the depth of 45-60cm. Maximum SOM was found at the depth of 0-15cm (0.61%) while minimum was observed at the depth of 45-60cm (0.35%) in D. sissoo. Under V. nilotica canopy at the 0-30cm (0.56%), 30-60cm (0.43%) the soil organic matter did not differ significantly. Highest soil organic carbon percentage was in V. nilotica (0.35%). The soil bulk density ranged from 1.09 to 1.37 g/cm³. At soil depths 0- 15 and 15-30cm in D. sissoo were sandy loam, whereas, in all other species at all soil depth it was loam. The soil structure was good to moderate in all cases under all species. The sand fraction was lowest under three species except P. cineraria (68.02%). Nitrogen was maximum found under the canopy of V. nilotica (11.1mg/kg) at the depth of 15-30cm. It was 9.1mg/kg under the canopy of D. sissoo at the depth of 15-30 cm. Available potassium was highest in 0-30cm in A. lebbek (109mg/kg). The study highlights importance of considering these tree species and soil depth when evaluating soil properties for soil fertility. The study provides valuable insights into the impact of leguminous tree species on soil health and fertility, which can inform future forestry and agricultural practices.

Key words: Agroforestry, Arid, Soil fertility, , Physiochemical, Nitrogen Fixing