Bacterial Consortium and Microbial Metabolites Increase Grain Quality and Soybean Yield

Abstract

The effects of Bradyrhizobium inoculation on soybean growth and productivity are well known, but plant responses to consortia of other beneficial microbes and microbial molecules have not yet been well explored. Therefore, the main aim of this study was to evaluate the effect of different combinations of beneficial bacteria with and without microbial secondary metabolites (MSM) on two soybean cultivars in three cropping seasons under tropical field conditions. The bacterial consortia consisted of Bradyrhizobium japonicum (strain SEMIA 5079) plus Bradyrhizobium diazoefficiens (strain SEMIA 5080) inoculated with different combinations of Bacillus subtilis (strain QST 713), Azospirillum brasilense (strains Ab-V5 and Ab-V6), and MSM (metabolites enriched in lipo-chitooligosaccharides (LCOs) extracted from B. diazoefficiens (strain USDA 110) and from Rhizobium tropici (strain CIAT 889)). Standard inoculation of Bradyrhizobium combined with Azospirillum brasilense and microbial secondary metabolites increased leaf total N (7.1%), total P (11.1%), and N-ureide (16.5%); nodule number (NN, 26%) and dry weight (NDW, 22%); root (RDW, 15.4%) and shoot dry weight (SDW, 6%); 100-seed weight (3.7%); grain yield (up to 516 kg ha −1 ); grain crude protein concentration (2.4%); and the agronomic efficiency index (AEI) (11%). Inoculation with bacterial consortia and metabolites increased grain yield and quality, representing a promising technology for sustainable soybean cropping in tropical regions.

Magnesium Foliar Supplementation Increases Grain Yield of Soybean and Maize by Improving Photosynthetic Carbon Metabolism and Antioxidant Metabolism

“…Prior the soybean sowing (cultivar TMG 7062 RR; 290,000 plants ha −1 ; Tropical Breeding & Genetics ® ; Cambé, Brazil), the seeds were first treated with fungicides (carboxin + thiram at 100 g + 100 g a.i. 100 kg −1 seeds) and later inoculated [ 76 ]. Each plot consisted of 10 rows that were 10-m long and spaced 0.45 m apart, covering an area of 45 m 2 .…”

Soybean in Crop Rotation with Maize and Palisade Grass Intercropping Enhances the Long-term Effects of Surface Liming in No-till System

“…The plots were fertilized with 00-20-20 of N-P 2 O 5 -K 2 O at 300 kg ha −1 in all three growing seasons. Seed inoculation was performed approximately 1 h before sowing by evenly coating the seeds with the appropriate amount of inoculant containing strains SEMIA 5079 ( B r a d yr h i z o b i u m j a p o n i c u m ) a n d S E M I A 5 0 8 0 (Bradyrhizobium diazoefficiens), according to the methodology proposed by Moretti et al (2020). Phytosanitary treatments were carried out according to the requirements and recommendations for soybean (Embrapa 2020).…”

Formulation of bacterial consortium for improvement growth and yield of maize (Zea mays L.)

“…This may occur because the consortia convert multiple nutrients, enhance microbial activity in the soil, and convert nutrients through the symbiotic association of bacteria and plant roots. This, in turn, promotes nodulation, nitrogen and phosphorus cycling, promotion in plant growth, increased grain yield, and protein concentration (Moretti et al, 2020).…”