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Biochar of the waste from seed cleaning to produce can improve soil fertility and carbon sequestration. Chemical properties of biochar are affected by input biomass (feedstock) type. Biochar production from wood pellets, pelletized sweet clovers, poppy residues, hay, straw, grass-seed and alfalfa is discussed. Micro-elements (Fe, Mn, Zn, Cu, B) in biochars prepared from different types of pelletized biomass are evaluated. All materials exhibited higher element contents. The highest Fe and Cu were in biochar from p...