In:
Journal of Plant Nutrition and Soil Science, Wiley, Vol. 183, No. 4 ( 2020-08), p. 500-516
Abstract:
To quantify carbon (C) and nitrogen (N) losses in soils of West African urban and peri‐urban agriculture (UPA) we measured fluxes of CO 2 ‐C, N 2 O‐N, and NH 3 ‐N from irrigated fields in Ouagadougou, Burkina Faso, and Tamale, Ghana, under different fertilization and (waste‐)water regimes. Compared with the unamended control, application of fertilizers increased average cumulative CO 2 ‐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 unamended control plots, fertilizer application increased N 2 O‐N emissions in Ouagadougou during different cropping cycles, ranging from 37 to 360%, while average NH 3 ‐N losses increased by 670%. Fertilizer application had no significant effects on N 2 O‐N losses in Tamale. While wastewater irrigation did not significantly enhance CO 2 ‐C emissions in Ouagadougou, average CO 2 ‐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 N 2 O‐N and NH 3 ‐N emissions were observed at either location. Although biochar did not affect N 2 O‐N and NH 3 ‐N losses, the addition of biochar could contribute to reducing CO 2 ‐C emissions from urban garden soils. When related to crop production, CO 2 ‐C emissions were higher on control than on fertilized plots, but this was not the case for absolute CO 2 ‐C emissions.
Type of Medium:
Online Resource
ISSN:
1436-8730
,
1522-2624
DOI:
10.1002/jpln.201900183
Language:
English
Publisher:
Wiley
Publication Date:
2020
detail.hit.zdb_id:
1481142-X
detail.hit.zdb_id:
1470765-2
detail.hit.zdb_id:
200063-5
SSG:
12
SSG:
13
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