Effect of Intensity and Time of Aeration on Agrochemical Properties of Extracts from Vermicompost

Vermicomposting is a completely environmentally friendly technology which converts biowaste to a value-added product. Extracts from vermicompost can be applied to plant surfaces and soils in ways not possible or economically feasible with solid vermicompost. The aim of this work was to determine the influence of aeration intensity and time of extraction on the agrochemical properties of aqueous extracts from two types of vermicomposts. Vermicomposts were made from horse manure (M) and apple pomace (P) waste.

There were 2 treatments: stirring (750 rates/min) without aeration (S), and stirring (750 rates/min) with aeration (6 L/min) (A). Samples were taken after 1, 6, 12, 24, and 48 hours of leaching. Aeration significantly increased the levels of the monitored agrochemical parameters found in the extracts. Under the experimental conditions utilized in this study, the highest increase within any parameter was found for chemical oxygen demand (COD) - (between 1 and 6 hours), which reflects the quick release of organic substances into solution. This resulted in a gradual decrease in the level of dissolved oxygen. The electrical conductivity (EC) and content of macro-elements in the extracts increased proportionally with time. The contents decreased in the following order: MA > MS > PA > PS. After 48 hours, the highest release of macro-elements into the extract was found in the case of MA. It contained 53%, 55%, 8%, and 14% of the total contents (measured by the XRF method) of P, K, Ca, and Mg, in vermicompost, respectively.



Copyright: © European Compost Network ECN e.V.
Source: Orbit 2014 (Juni 2014)
Pages: 0
Price: € 0,00
Autor: Dr. Ales Hanc
Pavel Svehla
Pavel Tlustoš

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