Fertilization practices on periurban farming system and recyclage organic residual product available in Mahajanga

In Mahajanga, Madagascar's provincial city with around 250.000 inhabitants, the urban population growth around 3% per year and concomitantly the need of food It is an opportunity for the development of a periurban agriculture to meet this growing demand. Soil fertility management is determinant in plant production. Market gardening currently suffers from a lack of organic fertilizers and minerals fertilizers remain inaccessible for a significant proportion of producers.

One option to response to this organic matter needs is to mobilize all organic resources that could be recycled. We carried out a cross-analyze between the present fertilizers’ practices in market gardening and the potential resources or organic residual products in and around the city. Agronomic value of the identified organic residual products was asses through chemical and biochemical analysis. The results showed that combined use of intensive animal organic matter and mineral nitrogen (urea) were the main fertilizers used in the leafy vegetables cropping systems. Twenty organic waste products were listed in the town; ten were selected for characterization through chemical and biochemical analysis. The organic residual products contained significant amounts of major nutrients for plant production. However, as the role of organic product and mineral fertilizers inputs were more complex than a simply question of chemical balance (mulch, quality products, fertilizers and amendment effects), it was necessary to test innovate organic fertilizers with an assessment of economic and social acceptation. Marginally of these work, long term consequence of current farmers’ practices of fertilization showed the important risk of pollution by nitrate in Mahajanga. More studies would have to be done to better assess the environmental impacts of the conventional and also new fertilization practices.



Copyright: © European Compost Network ECN e.V.
Quelle: Orbit 2012 (Juni 2012)
Seiten: 5
Preis inkl. MwSt.: € 5,00
Autor: Enseignante chercheur Heriniaina Ramahefarison
Dominique Masse
Christine Aubry

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