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 | |
| Artikel weiterleiten | In den Warenkorb legen
| Artikel kommentieren |
Diese Fachartikel könnten Sie auch interessieren:
DINplus – Neue Anforderungen an kompostierbare Bioabfallsammelbeutel und Konsequenzen für die Praxis
© Witzenhausen-Institut für Abfall, Umwelt und Energie GmbH (4/2023)
Viele Haushalte entsorgen weiterhin Teile ihrer Bioabfälle über die Restmülltonne, weil die separate Sammlung als unsauber empfunden wird. Als Lösung werden neben Papierbeuteln auch feuchtigkeitsresistente Kunststoffbeutel angeboten, die als „kompostierbar“ zertifiziert sind. Eine Reihe von Kommunen haben mit solchen Beuteln gute Erfahrungen gemacht, in vielen örE werden sie aber auch abgelehnt – es wird befürchtet, dass die Bürger sie mit herkömmlichen Kunststoffbeuteln verwechseln und in den Verwertungsanlagen der biologische Abbau zu lange dauert. Als Antwort auf diese Befürchtungen sind in der novellierten Bioabfallverordnung konkrete Regelungen formuliert worden. Nachfolgend werden aktuelle Entwicklungen zu diesem Thema beschrieben.
Multi-component heat and mass transport model for composting process: Experimental validation
© European Compost Network ECN e.V. (6/2012)
Composting consists in an aerobic process where the organic matter from wastes is biodegraded and converted into a stable granular material called compost. Even if composting is considered to be based on natural phenomenon, it is governed by very complex mechanisms, involving many parameters such as quality and accessibility of the nutriments
for micro-organisms, local oxygen content, temperature of the medium, pH, moisture content, and so on (Mustin, 1987, Diaz et al., 2007;). These parameters directly affect biodegradation kinetics. Moreover, they are interdependent and impacted by the operating conditions, which make difficult the understanding of the process.
Effect of ammoniacal Nitrogen on methanogenic metabolic pathways during MSW anaerobic digestion
© European Compost Network ECN e.V. (6/2012)
Municipal solid waste (MSW) represents an important renewable energy sources and the sustainable management of organic wastes is a major environmental and economic issue. The anaerobic digestion of MSW, which occurs inlandfills and methanization treatment plants, is a very complex process. The final step of the waste degradation, i.e.methanogenesis, which produces methane, leads to the production of a biogas that could be transformed into heat,electric power and fuel gas (renewable energy). In order to produce more efficiently this renewable energy and toenhance the degradation of the organic fraction of waste, bioreactors landfill and methanization treatment plants are twopromising management strategies.
Further Authors:
J. Epissard - Irstea
M. Lemunier - Suez Environnement
Mikrokunststoffe in Komposten und Gärprodukten
© Bundesgütegemeinschaft Kompost e.V. (12/2023)
Mikrokunststoffen (MKS) in der Umwelt wird eine hohe Aufmerksamkeit in der Öffentlichkeit geschenkt. Hierbei bestehen im Hinblick auf die Belastung und Gefährdung terrestrischer Ökosysteme durch MKS erhebliche Wissenslücken.
Gezielte Fremdstoffentfrachtung für Ökoqualität
© Bundesgütegemeinschaft Kompost e.V. (12/2023)
Seit 2006 sind die Komposte des Kompost-werks Würzburg FiBL gelistet. 2016 folgte dann die Zulassung für Bioland/Naturland-Flächen und GQ-Bayern (geprüfte Qualität Bayern), so dass die zertifizierten Komposte in den Ökolandbau und auf konventionellen Flächen nach GQ-Bayern vermarktet werden können.
