Technical and economic viability of co-inoculation with Azospirillum brasilense in soybean cultivars in the Cerrado

Fernando S Galindo,Poliana A L Rosa,Marcelo C M Teixeira Filho,Mariana G Z Ludkiewicz,Caio A Tritapepe,Salatier Buzetti

doi:10.1590/1807-1929/agriambi.v22n1p51-56

Fernando S Galindo, Poliana A L Rosa + Show 4 more

Open Access

https://doi.org/10.1590/1807-1929/agriambi.v22n1p51-56

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Abstract

ABSTRACT Biological nitrogen fixation (BNF) efficiency can be increased by co-inoculation with bradyrhizobia and Azospirillum brasilense, allowing even greater uptake of water and nutrients, leading to higher yields. Thus, this study aimed to evaluate the technical and economic viability of soybean in the Cerrado, according to the cultivars and co-inoculation with Azospirillum brasilense. The experiment was conducted in Selvíria, MS, in no-tillage system, in Oxisol, arranged in a randomized block design in a 2 x 2 factorial scheme with two cultivars (‘Potência’ and ‘Valiosa’), with and without co-inoculation with Azospirillum brasilense in the seed. Co-inoculation with A. brasilense increases grain yield in the cultivars ‘Potência’ and ‘Valiosa’, being economically viable. However, using the cultivar ‘Potência’ co-inoculated led to the highest profitability.

Highlights

The soybean crop occupied an area of 31.57 million hectares, with mean yield of 3,011 kg ha-1 in the 2014/2015 season, presenting itself as the main annual agricultural crop in planted area and marketing value (CONAB, 2015)
Considering the main current and potential limitations of Biological nitrogen fixation (BNF) in the soybean crop and the benefits caused in various crops by the inoculation with Azospirillum, especially greater root system development and, higher absorption of water and nutrients, it can be deduced that joint co-inoculation of bradyrhizobia and Azospirillum can enhance crop performance, in an approach that respects the current demands for agricultural, economic, social and environmental sustainability (Hungria et al, 2013)
As pondered by Hungria et al (2013), these effects promoted by the co-inoculation with plant growthpromoting bacteria (PGPB) and rhizobia seem to be influenced by specific signals among the bacterial genotypes involved and the host plant genotypes

Summary

Introduction

The soybean crop occupied an area of 31.57 million hectares, with mean yield of 3,011 kg ha-1 in the 2014/2015 season, presenting itself as the main annual agricultural crop in planted area and marketing value (CONAB, 2015). Considering the main current and potential limitations of BNF in the soybean crop and the benefits caused in various crops by the inoculation with Azospirillum (free-living diazotrophic bacteria), especially greater root system development and, higher absorption of water and nutrients, it can be deduced that joint co-inoculation of bradyrhizobia and Azospirillum can enhance crop performance, in an approach that respects the current demands for agricultural, economic, social and environmental sustainability (Hungria et al, 2013). Further research on the response of co-inoculation as a function of different genotypes is important for the development of cultivars more responsive to co-inoculation

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