Issue of agricultural use of bio-waste in the city of Lubumbashi: identification of stakeholders, practices and waste characterization. Objectives: An investigation was initiated to describe the profile of the stakeholders, the variability of the practices and analysis of the fertilizing values for each type of biowaste used in urban agriculture. Methodology and results: Determining the profile of the stakeholders was subjected to principal component analysis (PCA), while the parameters gathered around the practice of gardening were analyzed by chisquare test. Moreover, the physico-chemical composition of different types of bio-waste was analyzed to highlight the fertilizer relative value. The results obtained show that the market gardeners of Lubumbashi are mainly married women, aged over 18, and having no land title. Half of biowaste used was chicken manure and pig manure, obtained by purchase and come from the farms. The market gardeners prefer an application in the rough, they burrow into the soil. By spreading biowaste in soil, 33% market gardeners expect increased productivity and improved physico-chemical properties of soil against 48.3% to improve the vegetative aspect of vegetables and increasing yield. The composition of the types of biowaste has varied depending on the elements considered, like that their associated C/N ratio. Conclusion and application: The urban waste management constitutes a major problem in developing countries, identifying constraints to their development in urban agriculture presents an interesting perspective and a response to farmers.Useni et al. J. Appl. Biosci. 2014.Problématique de la valorisation agricole des biodéchets dans la ville de Lubumbashi.
RESUME Objectifs : L'objectif de cette étude était d'évaluer l'influence du génotype, de la date de semis et de la fertilisation inorganique (en 2008 et 2009) sur le rendement du maïs. Méthodologie et résultats : Un dispositif en split-plot comportant 2 génotypes de maïs semés à 4 dates retenues (15 novembre, 30 novembre, 15 décembre et 30 décembre) d'une part et de l'autre 8 génotypes et 4 doses de fertilisants inorganiques (D0=sans fertilisation, D1=150kg NPK+100 kg Urée, D2=300 kg Urée+200 kg urée et D3=600 kg Urée+400 kg urée), a été installé. Les génotypes de maïs montrent une réponse statistiquement significative aux apports d'engrais et aux dates de semis. Le rendement le plus élevé a été enregistré avec la dose D3 et la date du 30 novembre ; le Rapport Valeur sur Cout (RVC) étant cependant élevé avec la dose D2. Conclusion et application de la recherche : La dose D2 et la date du 30 novembre sont à recommander pour l'intensification de la culture du maïs dans la région de Lubumbashi.
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