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Registros recuperados : 31 | |
15. | | ALVAREZ, C.; COSTANTINI, A.; ALVAREZ, C. R.; URQUIAGA, S.; JANTALIA, C. P. Emissiones de óxido nitroso bajo diferentes secuencias de cultivo y sistemas de labranza en la región semiárida pampeana -Argentina-. In: CONGRESSO BRASILEIRO DE CIÊNCIA DO SOLO, 33., 2011, Uberlândia. Solos nos biomas brasileiros: sustentabilidade e mudanças climáticas: anais. [Uberlândia]: SBCS: UFU, ICIAG, 2011. Biblioteca(s): Embrapa Agrobiologia. |
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Registros recuperados : 31 | |
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Registro Completo
Biblioteca(s): |
Embrapa Agrobiologia. |
Data corrente: |
28/09/2022 |
Data da última atualização: |
28/09/2022 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 2 |
Autoria: |
ALVAREZ, C.; ÁLVAREZ, C. R.; COSTANTINI, A. O.; ALVES, B. J. R. |
Afiliação: |
INTA; Universidad de Buenos Aires; ALEJANDRO O. COSTANTINI, INTA; BRUNO JOSE RODRIGUES ALVES, CNPAB. |
Título: |
Soil nitrous oxide emissions in a maize (Zea mays L.) crop in response to nitrogen fertilisation. |
Ano de publicação: |
2022 |
Fonte/Imprenta: |
Soil Research, Published online: 13 June 2022. |
ISSN: |
1838-675X |
DOI: |
https://doi.org/10.1071/SR21094 |
Idioma: |
Inglês |
Conteúdo: |
Context: An appropriate use of the fertiliser technology may lead to a more efficient N absorption and to the reduction of economic and environmental costs. Aims: This study sought to quantify N2O emissions generated from soil and the residual nitrate (NO3?) up to 2 m depth in field conditions in a maize crop under supplementary irrigation and fertilised with two nitrogen (N) sources (UAN and urea) at increasing N rates (0, 80, 160 and 250 kg N ha?1) in the Semi-arid Argentine Pampas. Methods: Throughout the crop cycle, emissions were monitored daily with static chambers during the first week after fertilisation; then sampling frequency was gradually reduced until the end of the experiment. Key results: There were no yield responses to the use of different sources and N rates. Crop N uptake saturated at 80 kg N ha?1, reaching 300?310 kg N ha?1. Residual NO3? increased significantly with the highest rates of N fertiliser. Total N2O emissions differed significantly only among fertiliser rates. The N2O emissions were lower at 80 than at 160 and 250 kg N ha?1. Conclusions: The N2O emissions measured were lower than those calculated by the IPCC, even when only direct emissions were considered. No grain yield increase was observed due to N fertilisation, with a non-limiting supply of N-NO3? at the beginning of the crop cycle and of N from mineralisation. Implications: This excess of N can generate negative environmental effects due to higher emissions of N2O and residual N-NO3? that can be leached. MenosContext: An appropriate use of the fertiliser technology may lead to a more efficient N absorption and to the reduction of economic and environmental costs. Aims: This study sought to quantify N2O emissions generated from soil and the residual nitrate (NO3?) up to 2 m depth in field conditions in a maize crop under supplementary irrigation and fertilised with two nitrogen (N) sources (UAN and urea) at increasing N rates (0, 80, 160 and 250 kg N ha?1) in the Semi-arid Argentine Pampas. Methods: Throughout the crop cycle, emissions were monitored daily with static chambers during the first week after fertilisation; then sampling frequency was gradually reduced until the end of the experiment. Key results: There were no yield responses to the use of different sources and N rates. Crop N uptake saturated at 80 kg N ha?1, reaching 300?310 kg N ha?1. Residual NO3? increased significantly with the highest rates of N fertiliser. Total N2O emissions differed significantly only among fertiliser rates. The N2O emissions were lower at 80 than at 160 and 250 kg N ha?1. Conclusions: The N2O emissions measured were lower than those calculated by the IPCC, even when only direct emissions were considered. No grain yield increase was observed due to N fertilisation, with a non-limiting supply of N-NO3? at the beginning of the crop cycle and of N from mineralisation. Implications: This excess of N can generate negative environmental effects due to higher emissions of N2O and residual N-NO3? th... Mostrar Tudo |
Palavras-Chave: |
Argentinean Pampa; Environmental effects; Maize yield; Nitrate leaching. |
Thesaurus NAL: |
Greenhouse gases; Irrigation; Urea. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
Marc: |
LEADER 02296naa a2200265 a 4500 001 2146959 005 2022-09-28 008 2022 bl uuuu u00u1 u #d 022 $a1838-675X 024 7 $ahttps://doi.org/10.1071/SR21094$2DOI 100 1 $aALVAREZ, C. 245 $aSoil nitrous oxide emissions in a maize (Zea mays L.) crop in response to nitrogen fertilisation.$h[electronic resource] 260 $c2022 520 $aContext: An appropriate use of the fertiliser technology may lead to a more efficient N absorption and to the reduction of economic and environmental costs. Aims: This study sought to quantify N2O emissions generated from soil and the residual nitrate (NO3?) up to 2 m depth in field conditions in a maize crop under supplementary irrigation and fertilised with two nitrogen (N) sources (UAN and urea) at increasing N rates (0, 80, 160 and 250 kg N ha?1) in the Semi-arid Argentine Pampas. Methods: Throughout the crop cycle, emissions were monitored daily with static chambers during the first week after fertilisation; then sampling frequency was gradually reduced until the end of the experiment. Key results: There were no yield responses to the use of different sources and N rates. Crop N uptake saturated at 80 kg N ha?1, reaching 300?310 kg N ha?1. Residual NO3? increased significantly with the highest rates of N fertiliser. Total N2O emissions differed significantly only among fertiliser rates. The N2O emissions were lower at 80 than at 160 and 250 kg N ha?1. Conclusions: The N2O emissions measured were lower than those calculated by the IPCC, even when only direct emissions were considered. No grain yield increase was observed due to N fertilisation, with a non-limiting supply of N-NO3? at the beginning of the crop cycle and of N from mineralisation. Implications: This excess of N can generate negative environmental effects due to higher emissions of N2O and residual N-NO3? that can be leached. 650 $aGreenhouse gases 650 $aIrrigation 650 $aUrea 653 $aArgentinean Pampa 653 $aEnvironmental effects 653 $aMaize yield 653 $aNitrate leaching 700 1 $aÁLVAREZ, C. R. 700 1 $aCOSTANTINI, A. O. 700 1 $aALVES, B. J. R. 773 $tSoil Research, Published online: 13 June 2022.
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