Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/2997
Title: CARBON DIOXIDE AND GASEOUS NITROGEN EMISSIONS FROM BIOCHAR-AMENDED SOILS UNDER WASTEWATER IRRIGATED URBAN VEGETABLE PRODUCTION OF BURKINA FASO AND GHANA
Authors: Manka’abusi, D.
Lompo, D. J. P.
Steiner, C.
Ingold, M.
Akoto-Danso, E. K.
Werner, S.
Ha¨ring, V.
Nyarko, G.
Marschner, B.
Keywords: ammonia volatilization
biochar
carbon dioxide emissions
inorganic N fertilization
urban agriculture
wastewater irrigation
Issue Date: 2020
Series/Report no.: Vol. 183;Issue 4
Abstract: To quantify carbon (C) and nitrogen (N) losses in soils of West African urban and peri-urban agri culture (UPA) we measured fluxes of CO2-C, N2O-N, and NH3-N from irrigated fields in Ouaga dougou, Burkina Faso, and Tamale, Ghana, under different fertilization and (waste-)water re gimes. Compared with the unamended control, application of fertilizers increased average cumu lative CO2-C emissions during eight cropping cycles in Ouagadougou by 103% and during seven cropping cycles in Tamale by 42%. Calculated total emissions measured across all cropping cycles reached 14 t C ha–1 in Ouagadougou, accounting for 73% of the C applied as organic fertilizer over a period of two years at this site, and 9 t C ha–1 in Tamale. Compared with un amended control plots, fertilizer application increased N2O-N emissions in Ouagadougou during different cropping cycles, ranging from 37 to 360%, while average NH3-N losses increased by 670%. Fertilizer application had no significant effects on N2O-N losses in Tamale. While waste water irrigation did not significantly enhance CO2-C emissions in Ouagadougou, average CO2-C emissions in Tamale were 71% (1.6 t C ha–1) higher on wastewater plots compared with those of the control (0.9 t C ha–1). However, no significant effects of wastewater on N2O-N and NH3-N emissions were observed at either location. Although biochar did not affect N2O-N and NH3-N losses, the addition of biochar could contribute to reducing CO2-C emissions from urban garden soils. When related to crop production, CO2-C emissions were higher on control than on fertilized plots, but this was not the case for absolute CO2-C emissions.
URI: http://hdl.handle.net/123456789/2997
ISSN: 1522-2624
Appears in Collections:Faculty of Agriculture, Food and Consumer Sciences



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