A first record of bulk atmospheric deposition patterns of major ions in southern South America

Carnelos, Danilo; Portela, Silvina Isabel; Jobbágy, Estéban G.; Jackson, Robert B.; Bella, Carlos Marcelo Di; Panario, Daniel; Fagúndez, Carolina; Piñeiro-Guerra, Juan Manuel; Grion, L.; Piñeiro, Gervasio

doi:10.1007/s10533-019-00584-3

Cited by 7 publications

(2 citation statements)

References 32 publications

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“…For farmlets, the measured proportion of legume DM in mixed pastures was used. Nitrogen atmospheric deposition values were taken for two locations in Uruguay (25) .…”

Section: Nitrogen Importsmentioning

confidence: 99%

Balancing nitrogen at the farm gate

Stirling,

Lussich,

Ortega

et al. 2024

Agrocienc Urug

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Uruguay's dairy can potentially enhance milk productivity competitively, but intensification risks elevating nitrogen (N) surplus, heightening environmental concerns. This study quantified farm-gate N inputs and outputs, calculating N surplus (input-output) and N use efficiency (NUE=output/input) for 17 commercial modal dairy systems identified in the 2014 and 2019 national surveys and 6 prospective intensified systems based on experimental pastoral farmlets achieving near-maximal rainfed productivity. Current dairy systems maintained N surplus at 71 kg N ha-1 between 2014 and 2019 (range: 44-97 kg N ha-1) while improving NUE from 28.3 to 30.5% (range: 20-35%). Intensification increased N surplus without necessarily reducing NUE. Our analyses highlight three aspects: (i) comparatively low N surplus of current Uruguayan dairy, (ii) nonlinear links between N surplus and stocking rate, feed intake, milk productivity and operating profit, and (iii) inequality between dairy systems in their contribution to national dairy N surplus reflects mainly disparity in farm size. These insights underscore the crucial need for understanding the actual fate of N surpluses: nitrate leaching, ammonia volatilisation, N2 denitrification, or N accumulation in soil organic matter. This is an unavoidable requisite for designing management practices and policies able to effectively optimise the economic and environmental sustainability of Uruguayan dairy.

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“…For farmlets, the measured proportion of legume DM in mixed pastures was used. Nitrogen atmospheric deposition values were taken for two locations in Uruguay (25) .…”

Section: Nitrogen Importsmentioning

confidence: 99%

Balancing nitrogen at the farm gate

Stirling,

Lussich,

Ortega

et al. 2024

Agrocienc Urug

View full text Add to dashboard Cite

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“…Over the past decade, there has been a surge in research on nitrogen (N) deposition in cities around the world (e.g., [1][2][3][4][5][6]). Although there are many urban areas for which data are still sparse or nonexistent [7], research highlights three distinguishing characteristics of urban N deposition.…”

Section: Introductionmentioning

confidence: 99%

Ambient urban N deposition drives increased biomass and total plant N in two native prairie grass species in the U.S. Southern Great Plains

et al. 2021

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Remnants of native tallgrass prairie experience elevated atmospheric nitrogen (N) deposition in urban areas, with potential effects on species traits that are important for N cycling and species composition. We quantified bulk (primarily wet) inorganic N (NH4+-N + NO3--N) deposition at six sites along an urban development gradient (6–64% urban) in the Dallas-Fort Worth metropolitan area from April 2014 to October 2015. In addition, we conducted a phytometer experiment with two common native prairie bunchgrass species––one well studied (Schizachyrium scoparium) and one little studied (Nasella leucotricha)––to investigate ambient N deposition effects on plant biomass and tissue quality. Bulk inorganic N deposition ranged from 6.1–9.9 kg ha-1 yr-1, peaked in spring, and did not vary consistently with proportion of urban land within 10 km of the sites. Total (wet + dry) inorganic N deposition estimated using bulk deposition measured in this study and modeled dry deposition was 12.9–18.2 kg ha-1 yr-1. Although the two plant species studied differ in photosynthetic pathway, biomass, and tissue N, they exhibited a maximum 2-3-fold and 2-4-fold increase in total biomass and total plant N, respectively, with 1.6-fold higher bulk N deposition. In addition, our findings indicate that while native prairie grasses may exhibit a positive biomass response to increased N deposition up to ~18 kg ha-1 yr-1, total inorganic N deposition is well above the estimated critical load for herbaceous plant species richness in the tallgrass prairie of the Great Plains ecoregion and thus may negatively affect these plant communities.

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