Research on Physical and Chemical Properties of Different Biochars

Abstract

To provide instructive information for biochar research based on utilization of agricultural residues scientifically, we investigated physical and chemical properties of different biochars. According to a registered patent method from our institute, and a simple corncob pellet kiln and relevant biochar prepare method, we chose maize straw, rice hull and corncob et al. as raw materials and measured micro-structure, element composition, specific surface area, total pore volume and average pore diameter of these materials. Results showed that biochars from all materials behaved smoothly, clear structure and average C content 60%, average ash content less than 33%. All biochars were alkaline. With high porosity, peanut hull biochar and mushroom matrix biochar tended to be designed as fertilizer carrier in agriculture. In terms of nutrients analysis, maize straw and corncob were qualified to be applied to low potassium content and low pH soil, but rice hull biochar should be used on low phosphorous content soil. There would be a wide applying spectrum of soil for rice straw biochar.