The effects of Biochar and combinations with organic manures on plant biomass and soil properties were tested in a lab experiment with two different soils. Highest applications (10%) of Biochar alone implicated a plant growth decrease while the manure combinations increased biomass, especially in the Luvisol. This positive reaction was not detected in the Regosol during the experiment. Increasing rates of the different amendments decreased soil bulk density, especially in the Luvisol. Manures increased soil respiration, Biochar had nearly no effect. In order to improve soil fertility, combining Biochar with organic N-fertiliser is recommended
