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• W2016209006 abstract "Urban and peri-urban agriculture (UPA) is an important livelihood strategy for the urban poor in sub-Saharan Africa and contributes to meeting increasing food demands in the rapidly growing cities. Although in recent years many research activities have been geared towards enhancing the productivity of this land-use system, little is known about turnover processes and nutrient efficiency of UPA. The aim of our study therefore was to determine horizontal fluxes of N, P, K, and C as well as gaseous N and C emissions in urban vegetable gardens of Bobo-Dioulasso, Burkina Faso. Two gardens referred to as “Kodéni” and “Kuinima” were selected as representative for urban and peri-urban systems classified as: (1) “commercial gardening + field crops and livestock system” and (2) “commercial gardening and semicommercial field crop system”, respectively. A nutrient-balance approach was used to monitor matter fluxes from March 2008 to March 2009 in both gardens. Ammonia (NH3), nitrous oxide (N2O) and carbon dioxide (CO2) emissions from the respective soils were measured during the coolest and the hottest period of the day using a closed-chamber system. Annual partial balances amounted to 2056 kg N ha–1, 615 kg P ha–1, 1864 kg K ha–1, and 33 893 kg C ha–1 at Kodéni and to 1752 kg N ha–1, 446 kg P ha–1, 1643 kg K ha–1, and 21 021 kg C ha–1 at Kuinima. Emission rates were highest during the hot midday hours with peaks after fertilizer applications when fluxes of up to 1140 g NH3-N ha–1 h–1, 154 g N2O-N ha–1 h–1, 12 993 g CO2-C ha–1 h–1 were recorded for Kodéni and Kuinima. Estimated annual gaseous N (NH3-N + N2O-N) and C (CO2-C + CH4-C) losses reached 419 kg N ha–1 and 35 862 kg C ha–1 at Kodéni and 347 kg N ha–1 and 22 364 kg C ha–1 at Kuinima. For both gardens, this represented 20% and 106% of the N and C surpluses, respectively. Emissions of NH3, largely emitted after surface application of manure and mineral fertilizers, accounted for 73% and 77% of total estimated N losses for Kodéni and Kuinima. To mitigate N losses nutrient-management practices in UPA vegetable production of Bobo-Dioulasso would greatly benefit from better synchronizing nutrient-input rates with crop demands." @default.
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• W2016209006 date "2012-11-29" @default.
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• W2016209006 title "Gaseous emissions of nitrogen and carbon from urban vegetable gardens in Bobo‐Dioulasso, Burkina Faso" @default.
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• W2016209006 doi "https://doi.org/10.1002/jpln.201200012" @default.
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