Figure 2 shows the change of mass moisture content with time, and the first drying stage seems to have the greatest effect, because the change of mass moisture content of all samples is more significant in the first drying stage than in the later drying stage. The first drying / wetting cycle showed that the more biochar content, the higher the mass moisture content and the better the water holding capacity of soil samples at the same time. The peak values of PPSB and PPMB curves were higher than those of unmodified biochar.<br>
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