Abstract
ABSTRACT Adopting sustainable technologies that optimize biological nitrogen fixation by grain legumes is vital to improve plant growth and ensure high grain yield levels. This study investigated the effectiveness of molybdenum application methods and inoculation with Bradyrhizobium japonicum and Azospirillum brasilense either alone or in combination with nodulation and growth of cowpea and mungbean plants cropping in sandy soil from the Brazilian Cerrado. The experiments were arranged in a randomized block design in a 3 × 5 factorial arrangement with four replicates. The treatments consisted of three Mo application methods (control, seed treatment, and foliar application) and five nitrogen supply methods [control (uninoculated seeds and unfertilized with N), inoculation with Bradyrhizobium japonicum, inoculation with Azospirillum brasilense; co-inoculation with B. japonicum and A. brasilense, and a treatment with mineral N application]. Our results showed that co-inoculation with Bradyrhizobium japonicum and Azospirillum brasilense improves the root nodulation of mungbean plants compared to inoculation of B. japonicum alone or A. brasilense alone. The molybdenum application on seeds or leaves has little effect in enhancing the nodulation and growth of cowpea and mungbean plants grown in agricultural soils from the Brazilian Cerrado.
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