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Biochar, as a product of carbon-rich thermal degradation of biomass, can increase crop yield and retention capacity of soil, improve soil quality and nutrient cycle. The use of biochar has positive effect primarily on soils with low quality, so its use in conventional agricultural temperate soils has often different effects and depends especially on the biochar feedstock and the pyrolysis process. There are not many research papers which are studying changes in biochar properties over time, i.e. whether the biocha...