| Autor: |
Sofía Stirling, Facundo Lussich, Gastón Ortega, Alejandro La Manna, Ana Pedemonte, Jorge Artagaveytia, Gabriel Guidice, Santiago Fariña, Pablo Chilibroste, Fernando Alfredo Lattanzi |
| Jazyk: |
English<br />Spanish; Castilian<br />Portuguese |
| Rok vydání: |
2024 |
| Předmět: |
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| Zdroj: |
Agrociencia Uruguay, Vol 28, Iss NE1, p e1243 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2730-5066 |
| DOI: |
10.31285/AGRO.28.1243 |
| Popis: |
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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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