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
| Autor: | Segundo Urquiaga, Mohammad Zaman, R. M. Boddey, Bruno José Rodrigues Alves, Selenobaldo Alexinaldo Cabral Sant'Anna, Claudia Pozzi Jantalia, Roberto Christ Vianna Santos, Márcio dos Reis Martins, R.C. Monteiro |
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| Rok vydání: | 2017 |
| Předmět: |
Nitrapyrin
Ecology Acrisol Urease biology Sowing 04 agricultural and veterinary sciences 010501 environmental sciences engineering.material Ammonia volatilization from urea 01 natural sciences chemistry.chemical_compound chemistry Agronomy Greenhouse gas 040103 agronomy & agriculture Urea engineering biology.protein 0401 agriculture forestry and fisheries Environmental science Animal Science and Zoology Fertilizer Agronomy and Crop Science 0105 earth and related environmental sciences |
| Zdroj: | Agriculture, Ecosystems & Environment. 247:54-62 |
| ISSN: | 0167-8809 |
| DOI: | 10.1016/j.agee.2017.06.021 |
| Popis: | 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−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−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. |
| Databáze: | OpenAIRE |
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