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The effect of biochar on thesoil carbon mineralization priming effect depends on the characteristics ofthe raw materials, production method and pyrolysis conditions. The goal ofthe present study is to evaluate the impact of three different types ofbiochar on physicochemical properties and CO2 emissions of a sandy loamsoil. For this purpose, soil was amended with three different biochars (BI,BII and BIII) at a rate of 8 wt% and soil CO2 emissions weremeasured for 45 days. BI is produced from a mixed wood sieving from wood chipproduction, BII from a mixture of paper sludge and wheat husks and BIII fromsewage sludge. Cumulative CO2 emissions of biochars, soil and amendedsoil were well fit to a simple first-order kinetic model with correlationcoefficients (r2) greater than 0.97. Results show a negative primingeffect in the soil after addition of BI and a positive priming effect in thecase of soil amended with BII and BIII. These results can be related todifferent biochar properties such as carbon content, carbon aromaticity,volatile matter, fixed carbon, easily oxidized organic carbon or metal andphenolic substance content in addition to surface biochar properties. Threebiochars increased the values of soil field capacity and wilting point, whileeffects over pH and cation exchange capacity were not observed

Factors driving the carbon mineralization priming effect in a sandy loam soil amended with different types of biochar