Cash for trash: An agro-economic value assessment of urban organic materials used as fertilizers in Cameroon

Autor: Robert Oliver, Laurent Parrot, Joël Sotamenou, Serge Simon, Francis Ganry, Laurent Thuriès, Denis Montange, Paula Fernandes
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Municipal solid waste
[SDV]Life Sciences [q-bio]
010501 environmental sciences
01 natural sciences
Agricultural science
Market price
2. Zero hunger
education.field_of_study
Prix de marché
Compost
04 agricultural and veterinary sciences
Déchet organique
Humus
Utilisation des déchets
Value (economics)
Humus potential
Environmental Engineering
Population
engineering.material
Fertilisation
12. Responsible consumption
education
0105 earth and related environmental sciences
E21 - Agro-industrie
business.industry
Q70 - Traitement des déchets agricoles
15. Life on land
Manure
Periurban agriculture
Fumier
Déchet urbain
13. Climate action
Agriculture
Africa
040103 agronomy & agriculture
engineering
0401 agriculture
forestry
and fisheries
Environmental science
business
Agronomy and Crop Science
F04 - Fertilisation
Zdroj: Agronomy for Sustainable Development
Agronomy for Sustainable Development, Springer Verlag/EDP Sciences/INRA, 2019, 39 (6), pp.52. ⟨10.1007/s13593-019-0598-7⟩
ISSN: 1774-0746
1773-0155
DOI: 10.1007/s13593-019-0598-7⟩
Popis: The rapid expansion of cities in sub-Saharan Africa generates increasing volumes of diversified organic wastes that require management and a high population need for local and fresh vegetables. Linking the different sources of organic materials generated in these cities with the needs of local food producers for fertilizers prepared from recycled organic materials is challenging. This requires that producers obtain the results they expect from the organic materials they recycle. Thus, recycling these organic materials in their raw form or after composting presents an opportunity for periurban agriculture, although the great variability in the quantity and quality of these materials raises questions about the consistency between their agronomic value and their economic value. In two large cities of Cameroon (Yaoundé and Bafoussam), different types of organic materials were sampled: unprocessed livestock waste and composts from manure or municipal solid waste. From an agronomic perspective, we calculated the fertilization value based on the nutrient (nitrogen, phosphorus, and potassium) content of the organic materials. From an economic perspective, we calculated the value based on the nutrient content of the organic materials and their substitution unit prices and recorded the current market price. This is the first time that this combined approach has been used in sub-Saharan Africa. Our results showed considerable variability and discrepancy in both the agronomic and the economic values. The market prices overvalued the urban composts by a factor of 6, while chicken feces were undervalued by a factor of 3. The unprocessed organic materials were the most interesting from an economic and agronomic perspective. Our findings suggest that (i) the composting process needs to be improved and (ii) the humus potential should be calculated to better assess the amendment value of organic materials and as a basis for adjusting their market price.
Databáze: OpenAIRE
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