Nitrogen Fertilization of Soybean in Mississippi Increases Seed Yield but Not Profitability

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

doi:10.2134/agronj2017.05.0271

Cited by 11 publications

(13 citation statements)

References 28 publications

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“…Although biological N 2 fixation has the ability to supply the largest proportion of the N requirement of the soybean crop, this symbiotic process has a high energy cost for plants (McCoy et al, 2018). Symbiotic microorganisms that fix atmospheric N require 16 moles of adenosine triphosphate (ATP) to reduce each mole of N, and these microorganisms obtain this energy from their host plants' rhizospheres (Hubbell;Kidder, 2009).…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, in the R 2 (full flowering) growth stage there is a rapid accumulation of dry biomass and nutrients in soybean plants (Werner et al, 2016), indicating that the supply of nutrients, especially N, is crucial for photoassimilate synthesis and seed development. Thus, any deficit between the crop N demand and amount of N supplied by the symbiotic process must be compensated for the absorption of N from other sources (McCoy et al, 2018). Sources of N supply can be constituted from the residual N of the soil (Zuffo et al, 2018a) and the application of mineral N fertilizer (Zuffo et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Bradyrhizobium spp. inoculation associated with nitrogen application enhances the quality of soybean seeds

Zuffo¹,

Ratke

Aguilera

et al. 2021

Ciênc. agrotec.

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The physiological seed quality can be altered by nutritional management of the soybean crop, especially by the fertilization with nitrogen (N), which is a structural component of several organic compounds, including proteins, and has an important catalytic role in the activation of several enzymes. The aim of this research was to investigate the effects of sources and application rates of mineral N fertilizer associated with inoculation of Bradyrhizobium spp. on physiological quality of soybean seeds. The treatments were arranged in a completely randomized block design, in a 3 × 5 factorial arrangement [three N fertilizer sources (Bradyrhizobium spp. inoculation; Bradyrhizobium spp. inoculation + urea application; and, Bradyrhizobium spp. inoculation + ammonium sulfate application) and five N application rates (0, 50, 100, 150 and 200 kg N ha-1)], with four replicates. Nitrogen fertilizer was applied in topdressing at R2 stage when soybean plants were in full flowering. The quality parameters evaluated in soybean seeds were: 1,000-seed mass, seed protein content, germination, first germination count test, seedling emergence, emergence speed index, accelerated aging, electrical conductivity, vigor and viability of seeds by tetrazolium test. The application of 50 kg N ha-1 of mineral fertilizer (ammonium sulfate or urea) associated with the Bradyrhizobium spp. inoculation enhanced the physiological quality of soybean seeds, resulting in higher seed germination percentage and higher emergence and seedling emergence speed index. The application of ammonium sulfate or urea (50 kg N ha-1) at full flowering of soybean plants inoculated with Bradyrhizobium spp. can improve the physiological quality of soybean seeds.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bradyrhizobium spp. inoculation associated with nitrogen application enhances the quality of soybean seeds

Zuffo¹,

Ratke

Aguilera

et al. 2021

Ciênc. agrotec.

View full text Add to dashboard Cite

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“…The response of seed composition due to the nitrogenous application has also shown to be inconsistent in previous studies. Further, economic analysis for our study showed that N application is not an economically feasible option for increasing soybean yield as net returns with N application at any rate was lower than the unfertilized soybeans for both soil types (unpublished data) [44]. Since there is no economic incentive to growers for seed oil or protein at the grain elevator, it is unlikely that N fertilizer will be adopted strictly for increasing seed composition constituents as yield is the main determinant factor for profit.…”

Section: Discussionmentioning

confidence: 78%

Nitrogen Sources and Rates Affect Soybean Seed Composition in Mississippi

Kaur¹,

Serson²,

Orlowski³

et al. 2017

Agronomy

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Soybean (Glycine max L.) seed is a major source of protein, oil, carbohydrates and other nutrients that are important for human and animal nutrition. Producers have considered applying nitrogen (N) fertilizer to soybean crop to maximize seed yield; however, its effect on seed composition is not well understood. The objective of this two-year (2015 and 2016) study was to evaluate the effects of N fertilizer sources and application rates (45, 90, 135 and 179 kg N ha −1 ) on soybean seed composition on two soil textures (clay and silt-loam) in Mississippi. The three fertilizer sources included in this study were urea with N-(n butyl) thiophosphoric triamide (Urea+NBPT), polymer-coated urea (PCU), and ammonium sulfate (AMS). Nitrogen application at 179 kg ha −1 on clay soil reduced seed protein by 1.05% compared to unfertilized soybeans in 2016. However, N application at 179 kg ha −1 increased oil content by 0.7% on clay soil compared to the unfertilized soybeans only in 2016. Nitrogen applications reduced stachyose content on both soil textures in 2015. The fatty acids showed variable response to N applications. Since, seed quality is not a trait from which growers receive an economic incentive, they are unlikely to adopt this practice for standard soybean production.

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“…As a result of the presence of multiple N fixing and N scavenging species, nutrient availability from the SHM treatment may have been continued for a longer period of time and benefited the succeeding soybean crop. This result indicates that soybean could benefit from supplemental N albeit its ability to fix atmospheric N (McCoy et al., 2018; Moreira, Moraes, Schroth, Becker, & Mandarino, 2017). A study in Nebraska reported that CC were able to provide other nutrients such as phosphorus to the subsequent row‐crop after decomposing (Sharma, Irmak, & Padhi, 2018).…”

Section: Resultsmentioning

confidence: 92%

Cover crop diversity for weed suppression and crop yield in a corn–soybean production system in Tennessee

Sabbagh

Jagadamma

Duncan

et al. 2020

Agrosystems Geosci & Env

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Weed communities may potentially reduce row‐crop yields resulting in a loss of revenue for producers. Studies have reported a decrease in the efficacy of chemical methods of weed control due to increased weed resistance. With the goal of reducing reliance on chemical weed control and promoting sustainable crop production in mind, we evaluated different winter cover crop (CC) types (single‐, double‐, and multi‐species) and CC planting methods (broadcasting vs. drilling) on CC and weed groundcover and row‐crop yield in a no‐till corn (Zea mays L.)–soybean [Glycine max (L.) Merr.] rotation system in Tennessee from 2013 to 2017. Our results showed that winter CC reduced spring weed ground coverage by 64–76% compared with winter fallow with no herbicide application. A five‐species CC mixture increased soybean yields by 6 to 8.5% across seeding method treatments compared with other CC treatments and winter fallow. This yield increase was more visible in a drought year. Corn, grown in years with normal weather patterns, did not show a yield response to CC types. From this study, cover cropping was found to be an effective strategy for weed control compared with leaving the field fallow without herbicide application following row‐crop harvest; however, no consistent species‐specific trends were observed on weed suppression and row‐crop yield. Future research should focus on understanding CC species composition and biomass production in double‐ and multi‐species mixtures from this field experiment to draw robust conclusions on agronomic responses of individual CC species and planting methods.

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Nitrogen Fertilization of Soybean in Mississippi Increases Seed Yield but Not Profitability

Cited by 11 publications

References 28 publications

Bradyrhizobium spp. inoculation associated with nitrogen application enhances the quality of soybean seeds

Bradyrhizobium spp. inoculation associated with nitrogen application enhances the quality of soybean seeds

Nitrogen Sources and Rates Affect Soybean Seed Composition in Mississippi

Cover crop diversity for weed suppression and crop yield in a corn–soybean production system in Tennessee

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