المدني, فتح الله2026-01-302026-01-302022-11https://dspace.omu.edu.ly/handle/123456789/514A pot experiment was carried out at farm of soil and water science department، Faculty of Agriculture. Omar El-mukhtar. University. Al-Baida. Libya ، To study the effect of biochar addition at rate 0.0 ، 5.0، 15.0 ، 25.0 ton /h. As soil organic amendments on Sandy soil characteristics of so growth and productivity of wheat crop. Results revealed that ، The application of biochar In two size ، Improve soil physical، Chemical and fertility properties as well as enhance plant growth and yield of wheat crop as compared to control treatment. Also ، The highest rate of biochar at 25 ton /h recorded the highest values of growth and productivity parameters of wheat crop and soil properties. The results of soil analysis showed that adding biochar in varying sizes had a positive effect represented in a decrease in the bulk density and an increase in soil porosity، The ability of the soil to retain water and the soil content of organic matter and nutrients، And the size of biochar granules smaller than "2" mm had the best effect on the properties of the soil. Soil with increased levels of addition compared to the larger granules، and it was also observed that biochar granules smaller than “2” mm had an advantage in decreasing the hydraulic conductivity of the soil.Thesis