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31 results

Mitigation of Mombasa Grass ( Megathyrsus maximus ) Dependence on Nitrogen Fertilization as a Function of Inoculation with Azospirillum brasilense

Rubson da Costa Leite ORCID logo , Antonio Clementino dos Santos ORCID logo , José Geraldo Donizetti dos Santos ORCID logo , Robson da Costa Leite ORCID logo , Leonardo Bernardes Taverny de Oliveira ORCID logo , Mariangela Hungria ORCID logo


ABSTRACT Using biological inputs to improve the efficiency of nitrogen fertilizers represents an alternative for the cultivation of grasses in tropical regions. Azospirillum brasilense is a species of plant growth promoting bacteria widely studied and used in inoculants. Thus, this study aimed to evaluate the performance of Mombasa grass ( Megathyrsus maximus ) in association with A. brasilense and nitrogen (N) fertilization. The study was conducted under field conditions in Araguaína-Tocantins State, between December 2017 and May 2018. The treatments […]

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New Native Rhizobia Strains for Inoculation of Common Bean in the Brazilian Savanna

Fábio Martins Mercante, Auro Akio Otsubo, Osmar Rodrigues Brito


ABSTRACT Maximization of biological nitrogen fixation in the common bean (Phaseolus vulgaris L.) crop depends on the genetic characteristics related to the plant, the symbiotic efficiency of rhizobia, and environmental factors. The objective of this study was to evaluate the performance of rhizobia selected beforehand from Cerrado (Brazilian tropical savanna) soils in Mato Grosso do Sul. The experiments were conducted in 2007 in the municipalities of Aquidauana, Anaurilândia, Campo Grande, and Dourados, all located in the state of Mato Grosso […]

Symbiotic effectiveness of Bradyrhizobium ingae in promoting growth of Inga edulis Mart. seedlings

Dilacy Sales Porto, Eliane do Nascimento Cunha Farias, Josimar da Silva Chaves, Brenda Ferreira Souza, Roberto Dantas de Medeiros, Jerri Édson Zilli, [...]


ABSTRACT Inga edulis Mart. is a leguminous tree adapted to acidic and low-fertility soils that establishes symbioses with nitrogen (N)-fixing bacteria. The identification of effective bacteria in biological N fixation may bolster the use of I. edulis in degraded or modified areas and agroforestry systems. Therefore, the aims of this study were evaluation of the symbiotic effectiveness of eight strains of the Bradyrhizobium genus native to Roraima in Inga edulis plants, and in vitro evaluation of the ability of the […]

Genetic Variability and Symbiotic Efficiency of Erythrina velutina Willd. Root Nodule Bacteria from the Semi-Arid Region in Northeastern Brazil

Kelly Alexsandra Souza Menezes, Indra Elena Costa Escobar, Ana Carla Resende Fraiz, Lindete Míria Vieira Martins, Paulo Ivan Fernandes


ABSTRACT Legume-rhizobia symbiosis is a cross-kingdom association that results in large amounts of nitrogen incorporated in food webs. For the Brazilian semi-arid region, data on genetic variability and symbiotic efficiency of Papilionoidae rhizobial communities are very scarce. The aim of this study was to evaluate the genetic variability and the symbiotic efficiency of eight rhizobial isolates obtained from “mulungu” (Erythrina velutina Willd.) nodules. For 16S rRNA gene sequencing, the genomic DNA was extracted using a commercial kit, amplified with universal […]

Bradyrhizobium spp. Strains in Symbiosis with Pigeon Pea cv. Fava-Larga under Greenhouse and Field Conditions

Márcia Rufini, Dâmiany Pádua Oliveira, André Trochmann, Bruno Lima Soares, Messias José Bastos de Andrade, Fatima Maria de Souza Moreira


ABSTRACT: Optimization of symbiosis between nitrogen-fixing bacteria and legumes has been extensively studied, seeking agricultural sustainability. To evaluate the symbiotic efficiency of nitrogen-fixing bacterial strains belonging to the Bradyrhizobium genus with pigeon pea (Cajanus cajan (L.) Millsp.) cv. Fava-Larga, experiments were conducted in Leonard jars (axenic conditions), pots with soil, and in the field. Ten strains were tested in Leonard jars, and three strains, in addition to BR 29, were selected according to their ability to promote the growth of […]

Nodulations and Grain Yields of Common Beans in Response to Nitrogen Fertilization or Seed Inoculation with Rhizobium Freirei

Renato Yagi, Diva Souza Andrade, Ariadne Waureck, José Carlos Gomes


ABSTRACT Knowledge of the responses of bean plants as a function of N fertilization or seed inoculation with rhizobia can direct crops to different market niches in different technological levels. The roots nodulation and the yield grains of 10 bean cultivars on nitrogen fertilization and seed inoculation with Rhizobium freirei were evaluated aiming to identify, in terms of grain yield, the more efficient and responsive to nitrogen fertilization, as well to symbiotic N fixation in relation to N fertilization. Two […]


Luciana Fernandes de Brito, Rafael Sanches Pacheco, Benedito Fernandes de Souza, Enderson Petrônio de Brito Ferreira, Rosângela Straliotto, Adelson Paulo Araújo


Common bean (Phaseolus vulgaris L.) may benefit from biological N 2 fixation, but inconsistent responses of the crop to rhizobium inoculation indicate the need for supplemental mineral N fertilization. In this study, we aimed to evaluate the response of the common bean crop to rhizobium inoculation in association with supplemental mineral N in the Cerrado (Brazilian tropical savanna) and Atlantic Forest biomes. Four field experiments were carried out, two in Santo Antônio de Goiás (State of Goiás), one in Valença […]


Paulo Ivan Fernandes, Saulo de Tarso Aidar, Carolina Vianna Morgante, Carlos Alberto Tuão Gava, Jerri Édson Zilli, Layane Silva Barbosa de Souza, [...]


Plant species that naturally occur in the Brazilian Caatinga (xeric shrubland) adapt in several ways to these harsh conditions, and that can be exploited to increase crop production. Among the strategic adaptations to confront low water availability, desiccation tolerance stands out. Up to now, the association of those species with beneficial soil microorganisms is not well understood. The aim of this study was to characterize Tripogon spicatus diazotrophic bacterial isolates from the Caatinga biome and evaluate their ability to promote […]

Inoculation of sugarcane with diazotrophic bacteria

Nivaldo Schultz, Jeferson Alves da Silva, Jailson Silva Sousa, Rafael Cassador Monteiro, Renan Pedula Oliveira, Valfredo Almeida Chaves, [...]


The sugarcane industry, a strategic crop in Brazil, requires technological improvements in production efficiency to increase the crop energy balance. Among the various currently studied alternatives, inoculation with diazotrophic bacteria proved to be a technology with great potential. In this context, the efficiency of a mixture of bacterial inoculant was evaluated with regard to the agronomic performance and N nutrition of sugarcane. The experiment was carried out on an experimental field of Embrapa Agrobiologia, in Seropédica, Rio de Janeiro, using […]

Soil litter stock and fertility after planting leguminous shrubs and forage trees on degraded signal grass pasture

André Barbosa Silva, Mario Andrade Lira Junior, José Carlos Batista Dubeux Junior, Márcia do Vale Barreto Figueiredo, Rayssa Pereira Vicentin


Pastures are the fodder supply of Brazilian livestock, and are exhaustively degraded by nitrogen (N) deficiency. Intercropping with legumes, aside from nitrogen fixation, may have secondary effects on soil fertility, such as acidification or nutrient movement from deeper to the surface soil layers. This study evaluated the soil litter stock and fertility of degraded Brachiaria decumbens pastures after planting leguminous shrubs and forage trees. For this purpose, we sampled (March 2010) degraded Brachiaria decumbens pasture planted in July 2008 in […]

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