| Full text | |
| Author(s): Show less - |
Soares, Johnny R.
;
Souza, Bruna R.
;
Mazzetto, Andre M.
;
Galdos, Marcelo V.
;
Chadwick, Dave R.
;
Campbell, Eleanor E.
;
Jaiswal, Deepak
;
Oliveira, Julianne C.
;
Monteiro, Leonardo A.
;
Vianna, Murilo S.
;
Lamparelli, Rubens A. C.
;
Figueiredo, Gleyce K. D. A.
;
Sheehan, John J.
;
Lynd, Lee R.
Total Authors: 14
|
| Document type: | Journal article |
| Source: | NUTRIENT CYCLING IN AGROECOSYSTEMS; v. N/A, p. 19-pg., 2023-01-28. |
| Abstract | |
Grasslands are the largest contributor of nitrous oxide (N2O) emissions in the agriculture sector due to livestock excreta and nitrogen fertilizers applied to the soil. Nitrification inhibitors (NIs) added to N input have reduced N2O emissions, but can show a range of efficiencies depending on climate, soil, and management conditions. A meta-analysis study was conducted to investigate the factors that influence the efficiency of NIs added to fertilizer and excreta in reducing N2O emissions, focused on grazing systems. Data from peer-reviewed studies comprising 2164 N2O emission factors (EFs) of N inputs with and without NIs addition were compared. The N2O EFs varied according to N source (0.0001-8.25%). Overall, NIs reduced the N2O EF from N addition by 56.6% (51.1-61.5%), with no difference between NI types (Dicyandiamide-DCD; 3,4-Dimethylpyrazole phosphate-DMPP; and Nitrapyrin) or N source (urine, dung, slurry, and fertilizer). The NIs were more efficient in situations of high N2O emissions compared with low; the reduction was 66.0% when EF > 1.5% of N applied compared with 51.9% when EF <= 0.5%. DCD was more efficient when applied at rates > 10 kg ha(-1). NIs were less efficient in urine with lower N content (<= 7 g kg(-1)). NI efficiency was negatively correlated with soil bulk density, and positively correlated with soil moisture and temperature. Better understanding and management of NIs can optimize N2O mitigation in grazing systems, e.g., by mapping N2O risk and applying NI at variable rate, contributing to improved livestock sustainability. (AU) | |
| FAPESP's process: | 17/08970-0 - Pasture potential and subsequent production of energy crops |
| Grantee: | Leonardo Amaral Monteiro |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 19/15819-1 - Greenhouse gases balance for bioenergy production and indirect pastureland intensification |
| Grantee: | Johnny Rodrigues Soares |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |
| FAPESP's process: | 16/08741-8 - Post Doc on pasture systems: potential for intensification around the globe |
| Grantee: | Johnny Rodrigues Soares |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 19/14333-8 - Infield N2O emissions in sheep grazing systems |
| Grantee: | Bruna Rabello de Souza |
| Support Opportunities: | Scholarships abroad - Research Internship - Scientific Initiation |
| FAPESP's process: | 18/11052-5 - Development and preliminary application of a multi-crop global energy crop yield model on pastureland |
| Grantee: | Murilo dos Santos Vianna |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 14/26767-9 - Global Sustainable Bioenergy Initiative: geospatial & environmental analysis of pastureland intensification for bioenergy |
| Grantee: | John Joseph Sheehan |
| Support Opportunities: | Research Projects - SPEC Program |
| FAPESP's process: | 17/06037-4 - Global Sustainable Bioenergy initiative: geospatial and environmental analysis of pastureland intensification for bioenergy |
| Grantee: | Julianne de Castro Oliveira |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 16/08742-4 - Post Doc on agave growth model, at the initiative "a global sustainable bioenergy (GSB)": environmental and spatial analysis of pastureland intensification for bioenergy |
| Grantee: | Deepak Jaiswal |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 18/10432-9 - N2O emission in livestock production: a meta-analysis study |
| Grantee: | Bruna Rabello de Souza |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |