Improving sustainability of common bean production systems by co-inoculating rhizobia and azospirilla

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2017-01

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Common bean is likely the most important grain legume on population feeding for developing countries worldwide. With a natural ability to establish symbiosis with rhizobia, the inoculation technology is poorly exploited, especially in co-inoculation with others plant growth promoting rhizobacteria. This work aimed to determine the agronomical performance of common bean co-inoculated with Rhizobium tropici and Azospirillum brasiliense. A set of seven field experiments were carried out for three consecutive years in experimental areas and, majorly in commercial farms. Treatments consisted of non-inoculated control (NI), N-fertilizer treatment (NfT), single inoculation of R. tropici (Rt), R. tropici + one dose of A. brasiliense on seed (Rt+Ab1s), R. tropici + two doses of A. brasiliense on seed (Rt+Ab2s), R. tropici + two doses of A. brasiliense sprayed on plants (Rt+Ab2p) and R. tropici + three doses of A. brasiliense sprayed on plants (Rt+Ab3p). Evaluations were based on the nodule number (NN), nodule dry weight (NDW), root dry weight (RDW), shoot dry weight (MSPA), grain yield (GY), relative grain yield to NfT treatment (RGY:NfT) and relative grain yield to Rt treatment. The average of seven field experiments showed an increase of about 9%, 25%, 35% and 31% in NN, NDW, RDW and SDW, respectively as compared to Rt treatment. These increases over nodulation and plant growth resulted in a GY about 3200 kg ha−1, representing an increase in GY of about 5% and 26% as compared to NfT and Rt treatments, respectively. The results indicate the feasibility of using rhizobia and azospirilla co-inoculation in commercial farms as an efficient technology in replacing N-fertilizers, helping to save expenses and preventing environmental risks.

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Plant growth promotion, Plant-bacteria interaction, Symbiosis, Biological N2 fixation

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SOUZA, José Eduardo Barbosa de; FERREIRA, Enderson Petrônio de Brito. Improving sustainability of common bean production systems by co-inoculating rhizobia and azospirilla. Agriculture, Ecosystems & Environment, [s. l.], v. 237, p. 250-257, 2017. DOI: 10.1016/j.agee.2016.12.040. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S0167880916306296. Acesso em: 3 jun. 2025.