Effect of the Interaction between Excreta Type and Nitrogen Fertilizer on Greenhouse Gas and Ammonia Emissions in Pastures

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Ongaratto, Fernando ; Fernandes, Marcia Helena Machado da Rocha ; Dallantonia, Erick Escobar ; Lima, Lais de Oliveira ; do Val, Guilherme Alves ; Cardoso, Abmael da Silva ; Rigobello, Izabela Larosa ; Gomes, Lais Mayumi ; Reis, Ricardo Andrade ; Ruggieri, Ana Claudia ; Malheiros, Euclides Braga

• Document type: Journal article
• Source: ATMOSPHERE; v. 14, n. 3, p. 18-pg., 2023-03-01.

Abstract

This study aimed to evaluate the emission factor of N2O, CH4, and the volatilization of NH3 for the combination of feces or urine with increasing doses of ammonium nitrate in tropical palisade grass pastures. The emission of greenhouse gases was assessed in eight treatments combining feces and urine with doses (75 and 150 kg of N ha(-1)) of ammonium nitrate, (32% N). The emission factor of N2O was 0.11, 0.19, and 0.17% for feces, urine, and 75 kg N ha(-1) year(-1) (as ammonium nitrate) and showed an additive linear effect when feces or urine were combined with increasing doses of N fertilizer. The emission factor of CH4 of feces (0.18 kg CH4 animal(-1) year(-1)) was similar irrespective of combination with ammonium nitrate. The N loss by volatilized NH3 has a decreasing linear effect (p < 0.05) for the combination of feces or urine with ammonium nitrate. We concluded that N2O and CH4 emission factors of feces and urine in tropical climate conditions are lower than those reported by the IPCC. However, their N2O emission factors are sharply enhanced when combined with ammonium nitrate. These results may contribute to improvements in national and regional greenhouse gas inventories of livestock production. (AU)

• FAPESP's process: 17/11274-5 - Decomposition of litter and greenhouse gases emission in Brachiaria grasses with increasing nitrogen fertilizer rates
• Grantee: Abmael da Silva Cardoso
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 17/18750-7 - Impact of sustainable intensification of beef production in tropical areas on climate change mitigation
• Grantee: Márcia Helena Machado da Rocha Fernandes
• Support Opportunities: Regular Research Grants