Nutrient uptake status and peanuts yield as a consequence of the cobalt and chelated zinc applications under different irrigation schemes

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Abstract Water stress is the most detrimental stress which has significantly affected the yield particularly in arid climates. It is quite important to provide peanuts with a suitable supplement that can enhance its resistance and yield. Therefore, the current study aims to study the efficacy of cobalt and zinc on peanuts growth, yield, nutrient contents, and water use under full and limited irrigation conditions. For this purpose, a split- split plot experiment was conducted in 2021 and 2022. Three levels of peanuts gross water requirements (GWR) (100, 80 and 60%) were allocated in the main plots. In the sub plots, the plants were treated with cobalt (0 and 7.5 mg l-1). While the sub-sub plots were divided to tested the impacts of chelated zinc as (foliar and soil applications). Under GWR60% we detected marked reductions in yield and it was found that the adoption of separate soil applications of zinc under these conditions or foliar applications of zinc under GWR100&80%, had a significant impact on the most examined traits. However, compared to the control, adopting GWR60% and applying separate cobalt application thereof have significantly led to a lowest decline in iron, copper, yield and water use. Moreover, it was found adoption of foliar zinc applications in a combination with cobalt under GWR60% improved yield. This study recommend adopting GWR60% and treating plants with combined applications of foliar zinc+ soil application of cobalt, which could help plants overcome the negative impacts of water stress and achieve the highest yield and water use.

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