BIOCHAR ACTIVATED BY NUTRIENT- AND MICROORGANISMS-ENRICHED LIQUIDS AS A SOIL AMENDMENT

摘要

Biochar is very stable in nature and lasts for thousands of years. Biochar addition to soil positively affects the ecosystem, such as soil fertility and biological activity. Adding biochar to soil do not always increases soil activity. Studies have shown that biochar may also have a negative impact on soil microflora. Although biochar provides nutrients and mineralizable carbon to soil microorganism, due to its strong adsorption power, it pulls out soil nutrients away from the soil and may show a negative effect on soil microflora and rhizosphere. Modification of biochar is important to avoid its adverse effects. Physical and chemical modifications are a common method for the activation of biochar. Chemical modification has more advantage than a physical modification in term of porosity, greater surface area, less aromatic compound, and more oxygen-containing group. Chemical modification of biochar requires the use of strong chemicals which increase the risk to environment pollution. In the modern time with the increasing pollution, there is a demand for a low-cost green method to activate biochar, beneficial to the farmers and the environment. Uncommon biological activation of biochar fits in all the above aspects.