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NUTRIENT BALANCES AND ECONOMIC PERFORMANCE IN URBAN AND PERI-URBAN VEGETABLE PRODUCTION SYSTEMS OF THREE WEST AFRICAN CITIES

Published online by Cambridge University Press:  22 August 2014

AISHA ABDULKADIR ,
SHEICK K. SANGARÉ ,
HAMADOUN AMADOU  and
JOHN O. AGBENIN
AISHA ABDULKADIR*
Affiliation:
Department of Soil Science, Faculty of Agriculture, Ahmadu Bello University, P.M.B 1044, Zaria, Nigeria
SHEICK K. SANGARÉ
Affiliation:
Department of Natural Resource Management, Institute for Environment and Agricultural Research, INERA, 01 BP 476, Ouagadougou 01, Burkina Faso
HAMADOUN AMADOU
Affiliation:
Centre Regional de Récherch, Agronomique de Sikasso Institute d’Economie Rurale, Sikasso, Mali
JOHN O. AGBENIN
Affiliation:
Department of Soil Science, Faculty of Agriculture, Ahmadu Bello University, P.M.B 1044, Zaria, Nigeria
*
Corresponding author. Email: [email protected]
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Summary

Urban and peri-urban (UPA) cultivation supplies fresh vegetables and employment for the increasing number of urban inhabitants. It is characterized by the use of large nutrient inputs to increase productivity and often associated with negative environmental risks. For these reasons, this study quantified nutrient (nitrogen, N; phosphorus, P; and potassium, K) flows and economic performance of UPA gardening of the three West African cities of Kano, Nigeria; Bobo Dioulasso, Burkina Faso; Sikasso, Mali, during a 2-year period using the Monitoring for Quality Improvement (MonQI) toolbox considering inflows and outflows sources. Average annual N, P and K balances were positive for all gardens in the three cities with N balances of 279, 1127 and 74 kg N ha−1 in Kano, Bobo Dioulasso and Sikasso, respectively, except for annual K deficits of 222 and 187 kg K ha−1 in Kano and Sikasso, respectively. Nitrogen use efficiencies were 63%, 51% and 87% in Kano, Bobo Dioulasso and Sikasso, respectively, with poor P use efficiencies due to excess application in all three cities. However, a high K efficiency was observed in Bobo Dioulasso (87%) while applications of K were lower than required in Kano and Sikasso with efficiencies of 121% and 110%, indicating possible K mining. The average annual gross margins from gardening indicated a statistically higher (p < 0.05) return of US$3.83 m−2 in Bobo Dioulasso than returns obtained in Kano (US$0.92 m−2) and Sikasso (US$1.37 m−2). Although an economically vibrant activity, intensive UPA vegetable production needs to be reviewed for strategic planning towards improving N and P use efficiencies in order to maintain its productivity as well as safeguard the environment. Appropriate K fertilization is necessary to avoid long term K depletion in Kano and Sikasso UPA gardening.

Type
Research Article
Information
Experimental Agriculture , Volume 51 , Issue 1 , January 2015 , pp. 126 - 150
Copyright
Copyright © Cambridge University Press 2014 

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