Shimaa, K., G. ., S. M. M., A. A. E. M., and I. M. “Usage of Geographic Information System for Management of Soil Fertility, Egypt: Research Article- DOI: 10.23953/cloud.Ijarsg.473”. International Journal of Advanced Remote Sensing and GIS, vol. 9, no. 1, July 2020, pp. pp. 3331-3349, https://cloudjl.com/index.php/RemoteSensing/article/view/10.