Digested bioenergy byproduct with low concentration of nutrients increased greenhouse gas emissions from soil

Author(s)

Canisares, Lucas Pecci ^[1] ; do Carmo, Janaina Braga ^[2] ; Pitombo, Leonardo Machado ^[2] ; Pires, Eduardo Cleto ^[1]

Affiliation

^[1] Univ Sao Paulo, Biol Proc Lab, Av Joao Dagnone, 1100, BR-13563120 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Environm Sci, Sorocaba Campus, Rod Joao Leme dos Santos Km 110, BR-18052780 Sorocaba - Brazil

• Document type: Journal article
• Source: Geoderma; v. 307, p. 81-90, DEC 1 2017.
• Web of Science Citations: 0

Abstract

This research measured greenhouse gas emissions (GHG) from well-drained soil after using two forms of vinasse (in natura and digested) as fertilizer and the interaction of both with urea. Although carbon (C) and nitrogen (N) content in digested vinasse was two times less than in the normal vinasse (part of the N was lost during filtration and used by cellular synthesis of reactor biomass), N2O emissions were four-fold higher in the treatment with digested vinasse plus urea (302.8 mg N-N2O m(-2)) than in the treatment with normal vinasse amended with urea (70.9 mg N-N2O m(-2)). Differently from all the other treatments, digested vinasse alone resulted in positive emissions of CH4 center dot CO2 emissions follow vinasse in natura > vinasse in natura + urea > digested vinasse + urea > urea > control > digested vinasse, contradicting again the paradigm of C availability and N2O emissions. Many efforts have been made to describe models with an input of nutrients, their availability and N20 release. It can be concluded that the amount of nutrients is not sufficient and microbiological factors may contribute to improve GHG emission estimates. (AU)

• FAPESP's process: 09/15984-0 - Bioenergy production from wastewaters and environmental fitting of liquid and solid wastes generated
• Grantee: Marcelo Zaiat
• Support Opportunities: Research Projects - Thematic Grants