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Biochar is a porous, carbon-rich material produced by heating of organic matter to temperatures between 300 пїЅC and 1000 пїЅC in an environment with limited or no oxygen. During the past decade, numerous articles focusing on the use of biochar have been published, but have shown inconsistent results. Reactions in the soil after the addition of biochar depend on the characteristics of biochar, soil, climate and soil-inhabiting organisms. However, due to high variability in the quality of biochar, its effects on so...