Cobalt is a beneficial element for growth of higher plants, but its essential for legumes nodulation and fixation of atmospheric nitrogen. Low levels of cobalt addition increase plant growth yield as well as fruit quality while high cobalt concentration exerted hazardous effect. In newly reclaimed soils and under water shortage cobalt help plants to resist stresses caused by salinity, high temperature, as well as deficit water and proved to have promotive effect on growth parameters and obtained yield. Concerning the soils of Egypt, it could be stated that newly reclaimed soils, have poor...