Seed inoculation with Azospirillum brasilense in the U.S. soybean systems

Reis, André Fróes de Borja; Rosso, Luiz H. Moro; Adee, Eric; Davidson, Dan; Kovács, P.; Purcell, Larry C.; Below, Frederick E.; Casteel, Shaun N.; Knott, Carrie A.; Kandel, Hans; Naeve, Seth L.; Singh, Maninder P.; Archontoulis, Sotirios; Ciampitti, Ignacio A.

doi:10.1016/j.fcr.2022.108537

Cited by 13 publications

(8 citation statements)

References 59 publications

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“…There was no significant difference between Azospirillum treatment (co-inoculat and only B. Japonicum, for any of the measured traits (Table 6). These results did not ag with a previous study where co-inoculation increased yield by 320 and 690 kg ha −1 at Fa ND, USA, 2020 and Prosper, ND, USA, 2019, respectively [19]. Despite the signifi yield increase in North Dakota reported by De Borja Reis et al [19], only three out o site-years (including other soybean growing regions in the USA) were responsive to inoculation, the authors considered an overall low impact of co-inoculation across USA and great uncertainty on the response.…”

Section: Co-inoculation With Azospilillumcontrasting

confidence: 99%

“…These results did not ag with a previous study where co-inoculation increased yield by 320 and 690 kg ha −1 at Fa ND, USA, 2020 and Prosper, ND, USA, 2019, respectively [19]. Despite the signifi yield increase in North Dakota reported by De Borja Reis et al [19], only three out o site-years (including other soybean growing regions in the USA) were responsive to inoculation, the authors considered an overall low impact of co-inoculation across USA and great uncertainty on the response. Most of the studies showing significant y increases with the use of co-inoculation were conducted in tropical environments.…”

Section: Co-inoculation With Azospilillumcontrasting

confidence: 99%

“…The co-inoculated treatment yielded significantly higher than the B. japonicum alone across all the environments and was not different from the treatment with N fertilizer [16]. In the USA, a multi-state experiment conducted over 25 site-years showed a positive impact of the co-inoculation on yield only at three sites, and two of them were located in eastern North Dakota [19].…”

Section: Introductionmentioning

confidence: 80%

“…Currently, only one co-inoculation study has included the northern soybean region in the USA and Canada [19]. Additional studies are necessary, as there might be a potential to enhance BNF and sustainably improve soybean productivity.…”

Section: Introductionmentioning

confidence: 99%

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Soybean Response to N Fertilization Compared with Co-Inoculation of Bradyrhizobium japonicum and Azospirillum brasilense

Bais,

Kandel,

DeSutter

et al. 2023

Agronomy

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The soybean [Glycine max (L.) Merrill] relationship with the bacteria Bradyrhizobium japonicum is responsible for providing around 60% of the nitrogen (N) required for the crop and the remaining N comes from the soil or supplemental fertilization. To investigate if higher yields are possible, supplemental N studies and co-inoculation of Rhizobium with Azospirillum are necessary. This N rate (0, 30, 56, 112, 336 kg N ha−1) and inoculation study was conducted across eight environments in eastern North Dakota, USA, in 2021 and 2022. Also, the effect of supplemental N and co-inoculation on nodulation was evaluated. When N was applied at 112 kg N ha−1, nodulation was significantly inhibited. Co-inoculation increased the number of large nodules and the volume of nodules; however, the yield was not different from inoculation with B. japonicum. Nitrogen at 112 and 336 kg ha−1 increased grain yield, protein yield, and seed weight; however, the higher N rate decreased plant population. There were significant positive relationships between yield and protein content and seed weight, and negative relationships between oil and protein content, and yield and oil content. Based on a polynomial relationship, the highest yield (3711 kg ha−1) would be achieved at 273 kg N ha−1. The application of N resulted in a yield increase but using current prices may not be an economical choice. Additional research is necessary to verify if co-inoculation with efficient strains can improve biological N fixation.

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Section: Co-inoculation With Azospilillumcontrasting

confidence: 99%

Section: Co-inoculation With Azospilillumcontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

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Soybean Response to N Fertilization Compared with Co-Inoculation of Bradyrhizobium japonicum and Azospirillum brasilense

Bais,

Kandel,

DeSutter

et al. 2023

Agronomy

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“…In a recent study, de Borja Reis et al. (2022) observed responses on seed protein concentration due to rhizobia inoculation in only two out of 25 site‐years, depicting a relatively low probability of responses across U.S. regions. In contrast, the association between protein concentration and foliar nutrition is not strongly grounded.…”

Section: Discussionmentioning

confidence: 99%

Soybean management for seed composition: The perspective of U.S. farmers

et al. 2022

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The soybean [Glycine max (L.) Merr.] compositional quality is mainly provided by the seed concentration of protein and oil. These traits are critical for sustaining global use, and although there is demand for high protein soybean, no mechanism to differentiate production is in place. At the opposite end of the supply chain, farmers are remunerated on a mass basis without having any incentive regarding seed composition. This study evaluated farmers' perspectives and knowledge on soybean quality and their propensity to adopt quality improvement technologies. Farmers from the main U.S. producing regions (n = 271) were investigated with a self‐administrated survey containing 21 questions during 2020 and 2021. Our results show that 84% are unaware of the current protein and oil levels from their own production. A small portion (1.4%) make management decisions (e.g., choice of genotypes or monitor quality) based on the implications on seed quality. However, practices already in place are likely to enhance the quality of seed, namely N nutrition (via rhizobia [12.9%] or fertilizer [5.9%]) and late‐season crop protection (17.1%). If farmers are financially rewarded by US$0.50 per bushel, a mindset change may occur. Based on these results, we concluded that shifts in the U.S. production system targeting protein or oil markets are possible, and the constraints are mainly related to on‐farm management. However, the challenges for improving the U.S. soybean competitiveness in global or niche markets also rely upon other segments of the production chain, specifically breeders, technology suppliers, and logistical structure.

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US soybean seed protein concentrations—Current status, challenges, and some potential crop management solutions

Chiluwal

2024

Agronomy Journal

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Soybean [Glycine max (L.) Merr.] is the major source of protein for livestock and poultry feed in many countries including the United States. The United States is the second largest exporter of the soybean in the world. Although soybean yield in the United States has gradually increased over the past few decades, a consistent decline in seed protein concentration during the same period has occurred. As a result, soybean meal produced from some US seeds fails to meet the high‐quality animal feed standards. Due to this trend, there is an urgent need to improve seed protein concentration to make US soybean competitive in the global feed market. This review article discusses the status of declining soybean seed protein concentration trend in the United States, its effect on soybean meal and animal feed quality and some potential solutions to promote soybean nutritional quality.

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Seed inoculation with Azospirillum brasilense in the U.S. soybean systems

Cited by 13 publications

References 59 publications

Soybean Response to N Fertilization Compared with Co-Inoculation of Bradyrhizobium japonicum and Azospirillum brasilense

Soybean Response to N Fertilization Compared with Co-Inoculation of Bradyrhizobium japonicum and Azospirillum brasilense

Soybean management for seed composition: The perspective of U.S. farmers

US soybean seed protein concentrations—Current status, challenges, and some potential crop management solutions

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