Dairy Slurry Application to Stubble-Covered Soil: A Study on Sustainable Alternatives to Minimize Gaseous Emissions
Arejacy Antonio Silva,
Mário Carvalho,
João Coutinho,
Ernesto Vasconcelos and
David Fangueiro
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Arejacy Antonio Silva: Instituto Federal de Educação, Ciência e Tecnologia de São Paulo, Rua Professor Celso F. Silva, 1333, Avare 18707-150, Brazil
Mário Carvalho: MED, Universidade de Evora, 7000-849 Evora, Portugal
João Coutinho: Centro de Química, Universidade de Trás-os-Montes e Alto Douro, Quinta de Prados, 5001-801 Vila Real, Portugal
Ernesto Vasconcelos: LEAF-Linking Landscape, Environment, Agriculture and Food Research Centre, TERRA Associated Laboratory, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal
David Fangueiro: LEAF-Linking Landscape, Environment, Agriculture and Food Research Centre, TERRA Associated Laboratory, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal
Agriculture, 2022, vol. 12, issue 7, 1-16
Abstract:
The development of sustainable application practices, which do not demand incorporation into the soil, is necessary to encourage slurry use in conservation agriculture (CA). Incorporation is the most common practice to reduce nitrogen losses from the applied slurry. However, in CA, soil disturbance must be avoided. Two experiments were conducted to evaluate strategies to reduce gaseous emissions from dairy slurry applied to stubble-covered soil without incorporation. We evaluated (1) effects on ammonia (NH 3 ) emissions of pretreatment by acidification (ADS), irrigation (IR) and placement under the stubble (US); and (2) effects of ADS, IR, US and delayed fertilization (RDS T16) on greenhouse gases (GHG). The results of the evaluated strategies were compared to raw slurry (RDS) and ammonium sulphate (MS). Additionally, in experiment 2, the results were compared to ammonium sulphate (MB) and slurry injection (IN), both in bare soil. ADS, US and IR decreased NH 3 emissions by 66%, 60% and 32.5%, respectively, with total N emissions NH 3 emissions accounting for more than 79% of N losses in slurry-based treatments. Late application reduced N 2 O emissions by 48%. GHG emissions from ADS, US and IR were similar to those from MS, MB and IN. ADS, US and IR are the most suitable strategies for slurry application in CA.
Keywords: GHG; GWP; N 2 O; NH 3; CO 2; nitrogen; no tillage; conservation agriculture; crop residues; manure (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:gam:jagris:v:12:y:2022:i:7:p:1021-:d:862431
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