Data/hora: 23/06/2024 04:28:37

Biblioteca(s): | Embrapa Agrobiologia.
Data corrente: | 03/07/2017
Data da última atualização: | 04/12/2017
Autoria: | MARTINS, M. R.; SANTANNA, S. A. C.; ZAMANC, B. M.; SANTOS, R. C.; MONTEIRO, R. C.; ALVES, B. J. R.; JANTALIA, C. P.; BODDEY, R. M.; URQUIAGA, S.
Afiliação: | UFRRJ; UFRRJ; SOIL and WATER MANAGEMENT & CROP NUTRITION, FAO AUSTRIA; UFRRJ; BRUNO JOSE RODRIGUES ALVES, CNPAB; CLAUDIA POZZI JANTALIA, CNPAB; ROBERT MICHAEL BODDEY, CNPAB; SEGUNDO SACRAMENTO U CABALLERO, CNPAB.
Título: | Strategies for the use of urease and nitrification inhibitors with urea: impact on N2O and NH3 emissions, fertilizer-15N recovery and maize yield in a tropical soil.
Ano de publicação: | 2017
Fonte/Imprenta: | Agriculture, Ecosystems & Environment, v. 247, n. 1, p. 54-62, 2017.
ISSN: | 0167-8809
DOI: | https://doi.org/10.1016/j.agee.2017.06.021
Idioma: | Inglês
Conteúdo: | Maize production accounts for the largest proportion of synthetic fertilizer-N used in Brazil, with most of it being urea. The use of this fertilizer raises significant agronomic and environmental concerns due to an elevated risk of gaseous N losses, resulting in low fertilizer-N recovery by plants and increasing anthropogenic greenhouse gas (GHG) emissions. In a field trial on a tropical Acrisol, we quantified the N losses caused by the gaseous emissions of NH3 and N2O and the grain yield and recovery of 15N-fertilizer by maize plants treated with urea with added nitrapyrin or N-(n-butyl) thiophosphoric triamide (NBPT). Under conditions favorable for gaseous N loss from fertilizers, nitrapyrin reduced the cumulative N2O emission by 49% over a period of 30 days after the subsurface application of side-banded urea (50 kg N ha&#8722;1) during maize sowing. The use of NBPT delayed urea hydrolysis and reduced the NH3 volatilization by 35%, which represents a significant reduction in indirect N2O emission due to subsequent atmospheric deposition. The use of nitrapyrin during sowing and NBPT during the V5 stage of maize growth enhanced urea-15N recovery by 53% and increased maize grain yield by 1.5 t ha&#8722;1 compared to regular urea. Our results indicate that considering the main potential N losses according to timing and placement of fertilizer, the specific use of inhibitors represents an efficient strategy to improve the urea-N recovery and the maize grain yield. The use of nitrification inhibitors can play an effective role in mitigating N2O emissions from typical N fertilization practices in maize-producing areas in Brazil. This study also indicates the need for considering indirect emissions in the overall balance of N2O emissions derived from enhanced-efficiency fertilizers.
Palavras-Chave: | Greenhouse gas; Isotope; N stabilizer; Tropical soil.
Thesaurus Nal: | nitrapyrin.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
Registro original: | Embrapa Agrobiologia (CNPAB)
Exemplares: | CNPAB - (40520-1) - UPC - AP - DD - 2017.00058 -  - 2017.00058 - DIS