N2O emissions from urine-treated tropical soil: Effects of soil moisture and compaction, urine composition, and dung addition

Author(s)

Cardoso, Abmael da Silva ; Quintana, Bruna Giovani ; Janusckiewicz, Estella Rosseto ; Brito, Liziane de Figueiredo ; Morgado, Eliane da Silva ; Reis, Ricardo Andrade ; Ruggieri, Ana Claudia

• Document type: Journal article
• Source: CATENA; v. 157, p. 325-332, OCT 2017.
• Web of Science Citations: 5

Abstract

Increasing attention is being paid to the importance of N2O emissions due to livestock activities in tropical countries. Understanding the key variables driving N2O emission could help minimize impacts of N2O release and improve the accuracy of N(2)Oinventories. We aimed to investigate the effects of soil moisture, soil compaction, urine composition, urine volume, and dung addition on N2O emissions from a urine -treated tropical Ferralsol under controlled conditions. Manipulated soil conditions (e.g., moisture content, compaction, and dung addition) affected N2O emissions when varying quantities of urine-N (p = 0.02) were applied (urine volumes remained equal) and when varying urine volumes (p = 0.04) were applied (quantities of urine-N remained equal). When the amount of urine-N applied was varied, the estimated N2O emission factor (EF) was 3.14 +/- 0.70%, 2.29 +/- 1.25%, 3.90 +/- 0.64%, 4.73 +/- 0.88%, and 6.62 +/- 1.10% for moist soil, dry soil, compacted soil, plus dung, and plus dung and compacted soil treatments, respectively. While varying the volume of urine, the estimatedN(2)O EF was 4.96 +/- 1.66%, 4.27 +/- 1.42%, 3.99 +/- 1.19%, 6.50 +/- 0.35%, and 7.37 0.76% for moist, dry soil, compacted soil, plus dung, and plus dung and compacted soils treatments, respectively. The urine-N concentration influenced N2O emissions (p = 0.02) {[}which decreased linearly (p = 0.062)] as well the volume of urine (p < 0.01) {[}which increased linearly (p < 0.01)]. The chemical form of the applied urine-N (urea, nitrate, or ammonium) did not affect N2O emissions and the emissions factor averaged 1.40 +/- 0.38%. N(2)Oproduction was affected by the KCI concentration in the urine (p < 0.01), and the effect was curvilinear. The key driving factor affecting N2O emissions was soil moisture content. The N2O response varied when the urine volume differed (in both moist and dry soil conditions), and with the addition of dung. (AU)

• FAPESP's process: 13/24782-8 - The effect of biochar on the contribution of nitrification and denitrification to the flux of N2O in tropical and temperate soil
• Grantee: Abmael da Silva Cardoso
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• FAPESP's process: 13/00204-5 - Ammonia volatilization and N2O emissions due beef cattle excretion in grassland
• Grantee: Serena Capriogli Oliveira
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 11/00060-8 - GHG full account and mitigation strategies in Brachiaria pastures submitted to different management
• Grantee: Telma Teresinha Berchielli
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 12/06718-8 - Nitrogen balance, emission of greenhouse gases and mitigation of N2O in the production of beef cattle grazing.
• Grantee: Abmael da Silva Cardoso
• Support Opportunities: Scholarships in Brazil - Doctorate