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Sustainability 2018, 10(7), 2437; https://doi.org/10.3390/su10072437

Title “Organic Fertilizers” in Vietnam’s Markets: Nutrient Composition and Efficacy of Their Application

1
Vietnam Institute of Meteorology, Hydrology and Climate Change (IMHEN), Hanoi 117000, Vietnam
2
Department of Environmental Ecology, Graduate School of Environmental and Life Science, Okayama University, Okayama 700-8530, Japan
*
Author to whom correspondence should be addressed.
Received: 27 April 2018 / Revised: 4 July 2018 / Accepted: 10 July 2018 / Published: 12 July 2018
(This article belongs to the Special Issue Assessment and Governance of Sustainable Soil Management)
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Abstract

Organic fertilizers have recently been gaining popularity; however, their governance is not completely assessed in developing countries. This study investigated the nutrient composition of so-called organic fertilizers in Vietnam’s markets and issues related to their production, and evaluated their potential to contaminate the groundwater. We analyzed the physicochemical properties of 12 domestic and four imported products of the fertilizers, and conducted a cultivation experiment in sandy soil with the fertilizer applied at a rate of 200 mg N kg−1 soil using an automatic watering apparatus in a greenhouse. We further studied the production of an “organic fertilizer” from coffee by-products. The nutrient content greatly varied among domestic products, whereas they were quite similar among imported products. The product packaging of the collected samples lacked information regarding raw materials. Two thirds of the domestic products contained over 30% of the total N in the inorganic form, implying that the N content dramatically increased in the fertilizers rather than in their supposed raw materials. The stages involved in the production were composting, the addition of extra soil as a bulking agent, and the mixing-in of chemical substances to increase the nutrient content before packing. The remarkably high ratio of inorganic N to total N was attributed to excessive N leaching from soil by the application of domestic fertilizers. These results suggested the need for quality criteria guidelines for organic fertilizers in Vietnam that underline not only nutrient levels, but also the control of raw materials and production process of compost, because they are closely related to nutrient uptake and the leaching loss of nutrients. View Full-Text
Keywords: coffee by-products; nutrient composition; N leaching; production; so-called organic fertilizer coffee by-products; nutrient composition; N leaching; production; so-called organic fertilizer
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Quynh, H.T.; Kazuto, S. Title “Organic Fertilizers” in Vietnam’s Markets: Nutrient Composition and Efficacy of Their Application. Sustainability 2018, 10, 2437.

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