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Symbiotic Efficiency and Genotypic Characterization of Variants of Bradyrhizobium spp. in Commercial Inoculants for Soybeans

Leonardo de Paiva Barbosa, Patrícia Freitas Costa, Paula Rose Almeida Ribeiro, Márcia Rufini, Amanda Azarias Guimarães, Fatima Maria de Souza Moreira


ABSTRACT: High yields obtained from soybean [Glycine max (L.) Merrill], and consequent profits, are related to efficient symbiosis of soybean with nitrogen fixing bacteria of the Bradyrhizobium genus. Inoculation with strains belonging to the Bradyrhizobium japonicum, B. elkanii, and B. diazofficiens species, approved by the Brazilian Ministry of Agriculture (MAPA), is a common practice for this crop. However, variations in the composition of inoculants can change the quality of the product. The aim of this study was to genetically identify […]


Franciele Caroline de Assis Valadão, Oscarlina Lúcia dos Santos Weber, Daniel Dias Valadão Júnior, Alex Scapinelli, Filipe Rafaeli Deina, Aloísio Bianchini


Associated with the benefits of the no-till system for the soil, there may be the formation of a vertical gradient of fertility and a compacted layer caused by heavy farm machine traffic, which may modify the root growth of crops. The aim of this study was to evaluate the effect of rates and forms of phosphate fertilizer application and soil compaction by machine traffic on the physical properties and root system of soybeans and maize. The study was conducted in […]

Soil water potencial and boron fertilization in growth and uptake of the nutrient for the soybean crop

Ricardo Robson Trautmann, Maria do Carmo Lana, Vandeir Francisco Guimarães, Affonso Celso Gonçalves Jr., Fabio Steiner


Soybean is one of the annual crops most demanding of boron (B); however, borate fertilizer should be managed cautiously, especially in regard to application rates, because of the narrow range between the appropriate level and toxic level for this nutrient in the soil. Another important factor directly related to B availability to plants refers to soil water conditions. In this context, this study evaluated the effect of sources and application rates of B on soybean growth (Glycine max) in a […]

Nutrient uptake and chemical changes in Oxisols planted to cover crops in rotation with soybean and corn

Wander Luis Barbosa Borges, Rogério Soares de Freitas, Gustavo Pavan Mateus, Marco Eustáquio de Sá, Marlene Cristina Alves


The effects on soil chemical properties brought about by cover crops vary considerably. This study was conducted to evaluate nutrient uptake by five cover crops used for grain, seed and forage production at different seed densities per hectare, as well as uptake by spontaneous vegetation, and their effect on the chemical properties of two Oxisols when grown in rotation with soybean and corn. The experiments were set up in Votuporanga, SP, Brazil and Selvíria, MS, Brazil in March 2008 after […]

 Dynamics of organic matter of a sandy soil under cerrado turned into cropland converted to soybean and millet succession

Jeander Oliveira Caetano, Vinícius de Melo Benites, Gilson Pereira Silva, Ivo Ribeiro da Silva, Renato Lara de Assis, Alberto Cargnelutti Filho


The use and management of Quartzipsamments can influence soil organic matter (SOM), but the magnitude of these variations for the specific conditions in the Cerrado (savanna-like vegetation) is still poorly studied. The aim of this work was to study the variations in SOM in a Quartzipsamment, after the conversion of native vegetation to cropland (soybean-millet rotation). Soil was sampled from 0-5, 0-10, 0-20 and 0-40 cm depths of a commercial field in Alto Garças, Mato Grosso, Brazil, of plots under […]

Physical properties of an oxisol as affected by soybean management systems

Karina de Vares Rossetti, José Frederico Centurion, Paula Regina de Oliveira, Itamar Andrioli


Improper tillage operations cause serious problems of soil conservation, above all compaction, causing pore space reduction of mainly the macropores, and affecting the physical-hydric properties. The purpose of this study was to verify the influence of different periods of management systems on the maximum density of a Red Oxisol in Jaboticabal, São Paulo State, and establish correlations with soybean yield, relative density and the soil critical moisture for compaction. The experiment was arranged in a completely randomized design with a […]

Potassium cycling and balance and soybean yield in an integrated crop-livestock system under no-tillage

Eric Victor de Oliveira Ferreira, Ibanor Anghinoni, Marcelo Hoerbe Andrighetti, Amanda Posselt Martins, Paulo César de Faccio Carvalho


Nutrient cycling and balance in integrated crop-livestock systems (ICL) are processes that involves soil, plant and animal components, beyond fertilization. Animal management, by modifying soil biotic and abiotic conditions, also influences this process as it affects the residue decomposition rate. The objective was to evaluate potassium (K) cycling and balance in an ICL system with grazing (black oat and ryegrass) intensities in the winter, followed by soybean cultivated in the summer. The experiment was conducted as of May of 2001 […]

In-furrow inoculation with Bradyrhizobium alternatively to seed inoculation of soybean

Jerri Édson Zilli, Vicente Gianluppi, Rubens José Campo, Janaina Ribeiro Costa Rouws, Mariangela Hungria


Biological N fixation in soybean is indispensable in Brazil, sparing the use of mineral N and reducing crop production costs. The objective of this study was to compare in-furrow inoculation of soybean with Bradyrhizobium to the traditional practice of seed inoculation, in an experiment performed in a soil with low organic matter content and without soybean-nodulating rhizobia. A field experiment was carried out in the Cerrado of Roraima in 2006 and repeated in 2007, with the treatments: (1) control (no […]

Cobalt and molybdenum concentrated suspension for soybean seed treatment

Regina Maria Quintão Lana, Marcos Vieira de Faria, Ivan Bonotto, Ângela Maria Quintão Lana


The concentrated suspension (CS), the basis of Mo trioxide, allows high Mo concentrations and is therefore a technical advance for seed treatment, since it allows the recommendation of the Mo at lower dosage than with the liquid solution formulations (LS). The purpose of this research was to evaluate the efficiency and doses of fertilizer with Mo and Co in concentrated suspension in comparison with liquid solution as well as fertilizers associated with phytohormones, applied in seed treatments, and their effect […]

Influence of fungicide seed treatment on soybean nodulation and grain yield

Jerri Édson Zilli, Karen Gonçalves Ribeiro, Rubens José Campo, Mariangela Hungria


Biological N2 fixation is a major factor contributing to the increased competitiveness of Brazilian soybeans on the international market. However, the contribution of this process may be limited by adverse conditions to symbiotic bacteria, such as fungicide seed treatments. This study aimed to evaluate the effects of the fungicides carbendazim + thiram and carboxin + thiram on soybean nodulation, plant growth and grain yield. Two field experiments were carried out in the Cerrado region of the State of Roraima, in […]

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