Nitrogen Fertilization of Soybean Affects Root Growth and Nodulation on Two Soil Types in Mississippi

McCoy, Justin M.; Kaur, Gurpreet; Golden, Bobby R.; Orlowski, John M.; Cook, Donald R; Bond, Jason A.; Cox, Michael S.

doi:10.1080/00103624.2017.1421649

Cited by 22 publications

(18 citation statements)

References 30 publications

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“…The impacts of the use of chemical N fertilizer on the N fixation and crop yield depend on the soybean cultivars and Bradyrhizobium strain, as well as on the amount and time of N application. McCoy et al (2018) verified that N application rates at sowing resulted in inhibition of root nodulation and root growth of soybean plants. Kaschuk et al (2016), evaluating the effect of N application rates (30 kg ha -1 and 50 kg ha -1 ) at sowing or full flowering of the soybean crop, found that the N fertilizer negatively affected the nodule number and size, pointing out a down-regulation in the symbiotic performance, without improving crop yields.…”

Section: Resposta De Cultivares De Soja Precoce a Adubação Nitrogenadmentioning

confidence: 76%

Response of early soybean cultivars to nitrogen fertilization associated with Bradyrhizobium japonicum inoculation

Zuffo

Steiner

Busch

et al. 2018

Pesqui. Agropecu. Trop.

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In early soybean cultivars of high productive potential, the use of chemical nitrogen (N) fertilizer may be a critical factor to meet the crop N requirements for obtaining high yields. In order to determine the response of early soybean cultivars to doses and times of nitrogen fertilizer application, associated with the inoculation of Bradyrhizobium japonicum, two field experiments were conducted in a Quartzipsamment soil from the Brazilian tropical Savannah, during the 2016/2017 and 2017/2018 growing seasons. The experimental treatments were arranged in a 2 × 3 × 4 factorial scheme, being two soybean cultivars (BRS 1074 IPRO and ST 797 IPRO), three application times of N fertilizer (sowing, 30 and 50 days after the emergence) and four N doses (0 kg ha-1, 20 kg ha-1, 40 kg ha-1 and 60 kg ha-1). The following variables were evaluated: plant height, shoot dry matter, number of nodules, nodule dry matter, first pod height, number of pods, number of grains per pod, 1,000-grain mass, grain yield and harvest index. The use of N fertilizer did not improve the production components and did not increase the soybean grain yield, regardless of the doses and times of application. Therefore, it was concluded that, if efficient strains of B. japonicum are used in areas of first soybean crop, in a Quartzipsamment soil with medium-high fertility, especially with a relatively high N availability due to the mineralization of the soil organic matter, there is no need to apply starter or late doses of nitrogen fertilizer.

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Section: Resposta De Cultivares De Soja Precoce a Adubação Nitrogenadmentioning

confidence: 76%

Response of early soybean cultivars to nitrogen fertilization associated with Bradyrhizobium japonicum inoculation

Zuffo

Steiner

Busch

et al. 2018

Pesqui. Agropecu. Trop.

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“…When soybean is grown in soils where N is deficient, the application of low N rates at sowing has been used as a starter fertilization, to compensate the lack of synchronism between the phase when seed N reserves are exhausted and the moment when plants begin to benefit from the N fixed by the bacteria (Embrapa 2013, Chibeba et al 2015). In turn, larger rates have been shown to negatively affect the nodulation process (Kaschuk et al 2016) and growth of soybean plants (McCoy et al 2018). However, the impact of the use of chemical N fertilizer on the nitrogen fixation and crop yield depends on the soybean cultivar and Bradyrhizobium strain, as well as on the amount and time of N application (Domingos et al 2015).…”

Section: Abstract Resumomentioning

confidence: 99%

Quality of soybean seeds in response to nitrogen fertilization and inoculation with Bradyrhizobium japonicum 1

Zuffo

Steiner

Busch

et al. 2018

Pesqui. Agropecu. Trop.

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Nitrogen fertilization may interfere in the quality of soybean seeds. This study aimed to determine the physiological and sanitary quality of soybean seeds, in response to levels and times of nitrogen (N) application associated with Bradyrhizobium japonicum inoculation. Treatments were arranged in a randomized block design, in a 2 × 3 × 4 factorial arrangement [two soybean cultivars (BRS 1074 IPRO and ST 797 IPRO), three application times (sowing, 30 and 50 days after emergence) and four N levels (0 kg ha-1, 20 kg ha-1, 40 kg ha-1 and 60 kg ha-1), with four replicates. The 1,000-seed mass, moisture content, germination rate, seedling height, shoot length, primary root length, total seedling dry matter, electrical conductivity, mechanical damage, vigor and viability (tetrazolium test) and sanitary quality of the seeds were measured. The use of mineral N, associated with the inoculation of B. japonicum bacteria, does not prove to be consistent, in terms of its effects on the physiological quality of soybean seeds, although the incidence of pathogens may be reduced.

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“…All that mattered was the net benefit of mutualism. This conflicts with empirical studies that have shown that increasing nitrogen availability leads to a reduction in the mutualist partnership (Vitousek et al 1997;Weese et al 2015;McCoy et al 2018;Taylor and Menge 2018) (but see (Simonsen et al 2015)). This suggests that microbial mutualism does not simply occur as an added benefit to the plant.…”

Section: Discussionmentioning

confidence: 86%

When Does Mutualism Offer a Competitive Advantage? A Game-Theoretic Analysis of Host-Host Competition in Mutualism

2021

Preprint

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Questions: Can resource-resource trade mutualism offer a competitive advantage to plants? If so, what are the conditions that give mutualism an advantage especially with regard to the size of the neighborhood? Hypothesis: We hypothesized that mutualism could offer a competitive advantage if the benefits outweighed the costs. We also hypothesized that this competitive advantage could lead to coexistence between mutualist and non-mutualist strategies within the same population. We also hypothesize that local neighborhood size (the number of competitors at a given moment) would change this response, though the specific direction of change was unclear to us. Method: We created an evolutionary game theoretic model in which a plant could either be a mutualist or non-mutualist that incorporated nutrients freely available to the plant, nutrients obtained only through mutualism with microbes, the cost of producing roots, the cost of trade with microbes, and neighborhood size. We sought ESS solutions as defined by the Nash equilibrium criterion. Key Assumptions: 1) Costs and benefits are fixed for all plants. 2) Freely available nutrients are equally shared between all competing plants in a local neighborhood. 3) Microbially obtained nutrients are shared equally between mutualistic plants in the local neighborhood. Conclusion: We found that mutualism could offer a competitive advantage if the net benefit was positive. Coexistence between mutualist strategies in our model happens because of competition between mutualists over the microbially available nutrient. Coexistence was more likely with greater neighborhood size but at the expense of mutualist fixation.

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Nitrogen Fertilization of Soybean Affects Root Growth and Nodulation on Two Soil Types in Mississippi

Cited by 22 publications

References 30 publications

Response of early soybean cultivars to nitrogen fertilization associated with Bradyrhizobium japonicum inoculation

Response of early soybean cultivars to nitrogen fertilization associated with Bradyrhizobium japonicum inoculation

Quality of soybean seeds in response to nitrogen fertilization and inoculation with Bradyrhizobium japonicum 1

When Does Mutualism Offer a Competitive Advantage? A Game-Theoretic Analysis of Host-Host Competition in Mutualism

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