Productive Increase in Soybeans from Hormone Treatment, Inoculation and Co-inoculation

Abstract

The increase in productivity in soybean cultivation has been achieved by many Brazilian producers, due to the technological advances related to soil management, mineral nutrition, pest and disease control, genetic improvement, and the use of beneficial microorganisms via inoculation and co-inoculation. However, the application of inoculants based on Bradyrhizobium japonicum and Azospirillum brasilense still needs to be better studied among the many soybean cultivars available in the market. Therefore, the objective of this study is to evaluate the production increase in three soybean cultivars, through the application of synthetic hormones, inoculant and co-inoculant. The experimental design was a randomized complete block design with four repetitions, in a 3x6 factorial scheme, with three soybean cultivars (Desafio 8473, TMG 1180 and CD 2737) and six seed treatments (Control, Inoculation, Hormonal, Co-inoculation, Co-inoculation + Hormonal and Inoculation + Hormonal). The treatments with the diazotrophic bacteria (Inoculation + Co-inoculation) and Hormonal did not influence the yields of cultivars 'CD 2737' and 'Desafio 8473', which can only be cultivated with the standard seed treatment of the region. The 'TMG 1180' cultivar has it’s yield increased when it’s seeds are inoculated with Hormonal seed treatments and with diazotrophic bacteria in Co-inoculation.