Volume 7 Article informations Applying biochar from date palm waste residues to improve the organic matter, nutrient status and water retention in sandy oasis soils Nissaf Karbout , Roland Bol , Nadhem Brahimc , Mohamed Moussa , Habib Bousnina Abstract This study aimed to valorize the waste of date palm tree of oasis system in south Tunisia into biochar and used like amendment to improve physical and chemical characteristic of sandy soil in south Tunisia. Biochar obtained after pyrolysis of date palm tree waste in absence of oxygen in temperature of 500 °C, and incorporate in sandy soil of south Tunisia with different rates (5 t/ha, 10 t/ha,15 t/ha and 20 t/ha) compared with untreated soil. The initial results indicate generally improvement in chemical characteristics with increase of biochar rates in soil like total carbon and nitrogen concentration and other essential elements in soil. Available water in soil increase with the increase of rate of biochar to attend a maximum in 20t/ha biochar, finally, production growth increase with biochar amendment to have a pic in the rate of 2t/ha. The promising results show a potential for biochar to become are important soil fertility amendment in Oasis farming, and at the same reducing residue waste. Key words: Oasis farming system, date palm waste, biochar, water retention, organic carbon, sandy soils.