الفهرس 
Role of cobalt on tomato and common bean growth and productivity
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Abstract
Cobalt is considered a border element for plant nutrition.It is proved to be beneficial for higher plants such as tomato,cucumber and olive ,in spite of the absence of evidence direct role in their metabolism.Cobalt is an essential element for legumes because of its use by micro-organisms in fixing atmospheric nitrogen.Cobalt is the central atom of vitamin B₁₂.Cobalt is an essential element for the synthesis of vitamin B₁₂ which is essential for the nitrogen fixing bacteria and it has been identified in root nodules of leguminous plants. Series of experiments were conducted to evaluate the role of both cobalt and vitamin B₁₂ in tomato and common bean plants nutrition.Therefore four pot experiments as well as four field experiments were carried out to investigate the effect of each cobalt or vitamin B₁₂ on the growth,yield quantity and quality of tomato and common bean plants .In the pot experiments,tomato and common bean plants were treated with a wide range of cobalt along with the same concentrations of vitamin B₁₂