Category Archives: Recycling of Biomass Ashes

Context-Dependent Wood Ash Effects on Nematodes

In accordance with earlier studies, wood ash increased nematode abundance (Hyvonen and Huhta 1989) in the autotrophic experiment (Nieminen 2009) but not in the heterotrophic experiment (Nieminen 2008b). Although nematodes were not identified, it is probable that their diversity was less in the simpler heterotrophic experiment, and this could partly explain their different response. Another major difference between the two […]

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Effects of Ash Amendments on Soil Fauna

Wood ash application at rates of 1 and 5 t ha-1 in a Scots pine stand in central Finland decreased numbers of the enchytraeid worm Cognettia sphagnetorum, and slightly changed the soil microarthropod community. Soil chemical parameters were also influenced by these treatments, whereas microbial communities were only affected by the higher ash concentration (Haimi et al. 2000). Enchytraeid size […]

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Materials and Methods

3.2.1 Chemical Analysis Total metals, P and S in crushed rock, bottom ash and plant material were extracted by 7 M KHNO3 and determined by inductively coupled plasma optical emission spectrometry according to ISO 11885 (ISO 2007). The pH of the soil was deter­mined in a solid-water suspension (1:2.5, v/v). Readily available P, K, Mg, and Ca in soil were […]

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Characterization of Olive Waste Ashes as Fertilizers

Rogelio Nogales, Gabriel Delgado, Mar Quirantes, Manuel Romero, Esperanza Romero, and Eduarda Molina-Alcaide Abstract Wet and dry olive cakes are the most important wastes generated when olive oil is produced. In recent years, both olive wastes have been incinerated to produce electricity, and thereby large amounts of fly and bottom ash are generated. In this study, physical, physicochemical, and chemical […]

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Experimental Design

A pot experiment in a greenhouse was performed. Two soils were used; a sand (Elverum) and a sandy loam (0ksna) (Table 3.1). The soils were selected for this experiment because of the low content of readily available K, Mg and P which was found by Jeng et al. (2006). Although the soils were sampled at the same locations as the […]

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Chemical Analyses

The calcium carbonate equivalent (CCE) content was determined by analyzing the evolution of CO2, after reaction with dilute hydrochloric acid, in a Bernard calci — meter (MAPA 1986). The total organic carbon content was determined by dichro­mate oxidation of the samples and subsequent titration with ferrous ammonium sulfate (Yeomans and Bremner 1989). The total Kjeldahl N was determined by semimicro-Kjeldahl […]

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Ash as Fertiliser or Fertiliser Supplement in Agroecosystems

Wood ash is not only a valuable fertiliser in forest ecosystems, it can also benefit agricultural soils, especially acid soil types. Analysing the impact of wood ash (5 and 201 ha-1) on an Italian agricultural soil regarding its physicochemical, microbiological and biochemical properties, Perucci et al. (2008) observed increasing pH values and electrical conductivity as well as decreasing microbial biomass […]

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