The Biochar was ground to pass through a 0.50 mm sieve. The Biochar moisture content was measured by oven drying a sub sample of 2 g at a temperature of 80 oC for 24 hours. Biochar haracterization was done according to the method described by Ahmedna et al. (1997). The bulk density was determined by filling a 10 ml tube with dry ground biochar.
The tubes were capped, tamped to a constant volume, and weighed. Bulk density was calculated by dividing the weight of the dry sample with the volume of the packed materials.