Enhancement of the Effect of Nitrogen Fertilization on Common Bean Plants Grown in Sandy Soils by Cobalt Application
Keywords:Phaseolus vulgaris, Nitrogenases activity, Vegetative growth, Seed yield attributes, Seed mineral contents, Seed nutritional quality
To evaluate the effective role and impact of cobalt soil applications as well as different nitrogen fertilizer levels on nodulation parameters, vegetative growth, seed yield, seed mineral contents and seed nutritional quality of common bean plants of the Nebraska cultivar. Two field experiments were conducted during the growing seasons of 2020 and 2021 at the Experimental and Production Station, National Research Centre, El-Noubaria region, Behera governorate, Egypt, under newly reclaimed sandy soil conditions and a drip irrigation system. The experiment design was a split-plot design with three replicates. The obtained results sharply indicated that applying cobalt at 10 ppm to the soil led to significant increases in all studied parameters of nodulation rate, vegetative growth, seed yield, seed mineral contents and seed nutritional quality of bean plants. The nitrogenase enzymes activity was closely related to the increase in nodule numbers/plant and fresh and dry weights of nodules on bean plant roots. Increasing the nitrogen fertilizer level from 25 to 100% of the recommended nitrogen dose caused gradual increases in all studied parameters of bean plants. Significant differences were found among different nitrogen application levels except for root fresh and dry weights. The interaction effect between cobalt soil applications and different nitrogen fertilization levels had significant differences on all studied characters of common bean plants. Experimental treatments of applying cobalt to the soil at 10 ppm combined with a complete dose of nitrogen 100% of the recommended dose gave the highest significant values of all measured parameters. The lowest values were obtained
when cobalt was applied at 0 ppm along with a 25% nitrogen fertilizer level.
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