Sustainability in Environment ISSN 2470-637X (Print) ISSN 2470-6388 (Online) Vol. 7, No. 3, 2022 www.scholink.org/ojs/index.php/se 56 Original Paper Effect of Indigenous Tree Species Component in Homegarden Agroforestry System on Selected Soil Physicochemical Properties in Habro District, Oromia Regional State, Ethiopia Shimelis Dekeba 1* , Lisanework Nigatu 2 & Muktar Mohammed 3 1 Oromia Agricultural Research Institute, Mechara Agricultural Research Center Mechara, Ethiopia 2 School of Natural Resource Management and Environmental Science, Haramaya University, Haramaya, Ethiopia 3 College of Natural Resource and Environmental Science, Oda Bultum University, Chiro, Ethiopia * Shimelis Dekeba, Oromia Agricultural Research Institute, Mechara Agricultural Research Center Mechara, Ethiopia Received: July 16, 2022 Accepted: August 10, 2022 Online Published: August 13, 2022 doi:10.22158/se.v7n3p56 URL: http://dx.doi.org/10.22158/se.v7n3p56 Abstract Homegardens are one of the most important niche in which farmers feel confident to plant and maintain tree and shrub species. Indigenous tree species that are used for soil fertility improvement in Homegardens in western Harerghe in general and Habro district have not been given much research attention. The study assessed the effect of indigenous tree species components of homegarden agroforestry system on selected soil physicochemical properties. The study was carried out in Habro district at three sites (Melka Belo, Haro Chercher and Lega Bera). Soil samples were collected from under Cordia africana and Faidherbia albida canopy and outside canopy at three distances (at half of the canopy radius under the tree, at canopy edge and at three times canopy radius away from the tree trunk outside the canopy) within the 0-20cm and 20 to 40cm soil depths. Mean total nitrogen, available phosphorus, available potassium and organic carbon were significantly higher under the tree canopy than outside the canopy area (P<0.05). Bulk density was significantly higher at subsurface than surface soil while organic carbon was significantly higher at surface soil than subsurface soil. The analysis of variance revealed that moisture content, soil texture and soil pH were not significantly affected by tree species, distance from the tree trunk and by soil depth. The present study demonstrates that Cordia africana and Faidherbia albida tree that were planted or maintained in homegarden