Data/hora: 15/06/2024 02:44:22

Biblioteca(s): | Embrapa Agrobiologia; Embrapa Soja.
Data corrente: | 11/04/2023
Data da última atualização: | 16/02/2024
Autoria: | MONTEIRO, R. C.; FRANCHINI, J. C.; JANTALIA, C. P.; URQUIAGA, S.; ALVES, B. J. R.; BODDEY, R. M.
Afiliação: | RAFAEL CASSADOR MONTEIRO, UFRRJ; JULIO CEZAR FRANCHINI DOS SANTOS, CNPSO; CLAUDIA POZZI JANTALIA, CNPAB; SEGUNDO SACRAMENTO U CABALLERO, CNPAB; BRUNO JOSE RODRIGUES ALVES, CNPAB; ROBERT MICHAEL BODDEY, CNPAB.
Título: | Soil nitrous oxide emissions from a soybean-wheat succession under different tillage systems in Southern Brazil.
Ano de publicação: | 2023
Fonte/Imprenta: | Revista Brasileira de Ciência do Solo, v. 47, Special Issue, e0220135, 2023.
Páginas: | 18 p.
DOI: | 10.36783/18069657rbcs20220135
Idioma: | Inglês
Conteúdo: | No-tillage (NT) has been largely adopted in Brazil as a strategy for soil conservation, but for the last decade, there have been governmental incentives for its adoption arising from its potential for soil C accumulation. Notwithstanding, the soil mulch formed from crop residues favors the maintenance of soil moisture and nutrients in the upper soil layers, which stimulates soil microbial activity and may increase the potential for nitrous oxide (N2O) emissions. In addition, double-cropping systems in the same year are typical in Brazil and the impact on the fraction of fertilizer N lost as N2O needs to be evaluated. This study aimed to assess the influence of soil tillage and N fertilization on N2O emissions in a wheat-soybean succession system as commonly practiced in southern Brazil. The experiment was carried out at Embrapa Soybean research station located in Southern Brazil. Treatments were conventional tillage (CT) and no-tillage (NT), with and without nitrogen fertilization for the wheat and no N fertilizer for the soybean. Closed-static chambers were used to monitor N2O fluxes for two consecutive years. Together with gas monitoring, soil samples were also taken and analyzed for mineral N, soil moisture and labile carbon. Soybean yields were higher under NT, which seemed to be the result of a higher soil water availability that helped to overcome extended periods without rainfall. Soil N2O emissions were similar between CT and NT, with just a tendency for higher emissions under NT. The highest emissions occurred from the soybean crop. In the second year under NT, the emissions from the soybean crop were higher when preceded by N-fertilized wheat, but the converse was true under CT. None of the soil variables consistently correlated with N2O emissions, with mineral-N as the best predictor in the second wheat cycle and soil moisture in the first soybean cycle. Calculated emission factors were not statistically different between CT and NT and consistently lower than the IPCC default of 1 %. The calculated N2O emission intensity by relating N2O emission to grain yield showed an environmental advantage of NT compared to CT by presenting a 44 % reduction in soybean and similar values for fertilized wheat.
Thesagro: | Glycine Max; Soja; Triticum Aestivum.
Thesaurus Nal: | Greenhouse gases; Soil minerals; Soybeans.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
Registro original: | Embrapa Soja (CNPSO)

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