The effect of biochar on the properties of a loamy sand Spodosol with different fertility level in the ploughed horizon has been studied in a 60-day laboratory experiment. It has been found that the application of biochar resulted in a significant increase of the soil water content in the range of soil-water potential from −5 to −50 kPa, a significant decrease of the total shrinkage of the soil with high level of fertility after three wetting-drying cycles, and the accumulation of a significantly higher content of nitrates in the soil. At a water content of 21%, less favorable conditions for the denitrification development were formed in the soil with high level of fertility than in the medium-fertile soil, which resulted in lower cumulative N 2 O emission from the former. The addition of biochar resulted in no significant changes in the cumulative emission of CO 2 from the studied soil but significantly reduced the emission of N 2 O from the soil at the simultaneous addition of biochar and clover residues.
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Rizhiya et al. (2015) studied this question.
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