title: Biochar lowers ammonia emission and improves nitrogen retention in poultry litter composting.
abstract: The poultry industry produces abundant quantities of nutrient-rich litter, much of which is composted before use as a soil amendment. However, a large proportion of nitrogen (N) in poultry litter is lost via volatilisation during composting, with negative environmental and economic consequences. This study examined the effect of incorporating biochar during composting of poultry litter on ammonia (NH3) volatilisation and N retention. Biochars produced at 550°C from greenwaste (GWB) and poultry litter (PLB) feedstocks were co-composted with a mixture of raw poultry litter and sugarcane straw [carbon (C):N ratio 10:1] in compost bins. Ammonia emissions accounted for 17% of the total N (TN) lost from the control and 12-14% from the biochar-amended compost. The TN emitted as NH3, as a percentage of initial TN, was significantly lower (P<0.05) i.e. by 60% and 55% in the compost amended with GWB and PLB, respectively, relative to the control. The proportion of N retained in the finished compost, as a percentage of initial TN, was 84%, 78% and 67% for the GWB, PLB and nil biochar control, respectively. Lower concentration of dissolved organic C (DOC) together with higher activity of beta-glucosidase and leucine-aminopeptidase were found in the GWB-amended compost (cf. control). It is hypothesized that lower NH3emission in the GWB-amended compost was caused not just by the higher surface area of this biochar but could also be related to greater incorporation of ammonium (NH4+) in organic compounds during microbial utilisation of DOC. Furthermore, the GWB-amended compost retained more NH4+at the end of composting than the PLB-amended compost. Results showed that addition of biochar, especially GWB, generated multiple benefits in composting of poultry litter: decrease of NH3volatilisation, decrease in NH3toxicity towards microorganisms, and improved N retention, thus enhancing the fertiliser value of the composted litter. It is suggested that the latter benefit is linked to a beneficial modification of the microbial environment.
authors.affiliation: School of Environment and Rural Science, Agronomy and Soil Science, University of New England, Armidale, NSW 2351, Australia; Ministry of Food and Agriculture (MOFA), Accra Metropolitan Assembly, Ghana. Electronic address: eagyarko@myune.ed.au.
authors.forename: Eunice
authors.initials: E
authors.lastname: Agyarko-Mintah
authors.affiliation: School of Environment and Rural Science, Agronomy and Soil Science, University of New England, Armidale, NSW 2351, Australia; NSW Department of Primary Industries, Trevenna Rd., Armidale, NSW 2351, Australia. Electronic address: annette.cowie@dpi.nsw.gov.au.
authors.forename: Annette
authors.initials: A
authors.lastname: Cowie
authors.affiliation: School of Environment and Rural Science, Agronomy and Soil Science, University of New England, Armidale, NSW 2351, Australia; NSW Department of Primary Industries, Wollongbar Primary Industries Institute, 1243 Bruxner Highway, Wollongbar, NSW 2477, Australia. Electronic address: lukas.van.zwieten@dpi.nsw.gov.au.
authors.forename: Lukas
authors.initials: L
authors.lastname: Van Zwieten
authors.affiliation: School of Environment and Rural Science, Agronomy and Soil Science, University of New England, Armidale, NSW 2351, Australia; NSW Department of Primary Industries, Elizabeth Macarthur Agricultural Institute, Woodbridge Rd., Menangle, NSW 2568, Australia. Electronic address: BP.Singh@dpi.nsw.gov.au.
authors.forename: Bhupinder Pal
authors.initials: BP
authors.lastname: Singh
authors.affiliation: School of Environment and Rural Science, Agronomy and Soil Science, University of New England, Armidale, NSW 2351, Australia. Electronic address: rsmilli2@une.edu.au.
authors.forename: Robert
authors.initials: R
authors.lastname: Smillie
authors.affiliation: NSW Department of Primary Industries, Tamworth Agricultural Institute, 4 Marsden Park Road, Calala, NSW 2340. Electronic address: steven.harden@dpi.nsw.gov.au.
authors.forename: Steven
authors.initials: S
authors.lastname: Harden
authors.affiliation: CREA - Centro di Ricerca per lo Studio delle Relazioni tra Pianta e Suolo, Via Trieste 23, 34170 Gorizia, Italy. Electronic address: flavio.fornasier@crea.gov.it.
authors.forename: Flavio
authors.initials: F
authors.lastname: Fornasier
mesh_terms: D000641:Ammonia / Q000032:analysis / Q000378:metabolism; D000818:Animals; D002606:Charcoal / Q000737:chemistry; D005308:Fertilizers; D008372:Manure; D009517:New South Wales; D009584:Nitrogen / Q000032:analysis; D016062:Porosity; D011200:Poultry; D012987:Soil / Q000737:chemistry; D013696:Temperature; D018505:Waste Management / Q000379:methods*
chemical_list: D005308:Fertilizers; D008372:Manure; D012987:Soil; C540010:biochar; D002606:Charcoal; D000641:Ammonia; D009584:Nitrogen
keywords: Ammonium; Greenwaste; Microbial function; Volatilisation