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Cobalt (Co) is an important trace element for animals, but not for plants except legumes, where it is required by rhizobia for N fixation in legumes modules (Howieson and Dilworth, 2016). Its importance insavingabout 25 % of nitrogen fertilizer, on one hand, and hence reducingthe environmental pollution with nitrogen, on the other hand,and., at the same time, minimizing the N fertilizer cost (Gad, 2012). Cobalt is not critical for all plants but may improve plant growth and yield (Minz etal., 2018). However, relatively lower concentration of cobalt helps in better nodulation and consequently a better growth and yield whereas at a higher level of cobalt, it reduces the bacterial population in the rhizosphere;leadingto a lower crop growth and yield (Minz et al., 2018).

Distribution and Forms of Cobalt and Its Relationship to Mineralogical Composition in Soils of the 10th of Ramadan City,Egypt