It is made of wood chips or rice husks by carbonizing at 400 ℃.
The porous material of Rice-husk charcoal has good air permeability and is
often used in agriculture.
[Effect of Rice-husk charcoal ]
1. Improve water retention, ventilation and drainage
2. Soil microbial proliferation
3. Neutralization of acidity
Carbon content: about 30%
Moisture : 7-13%