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Effects of Pyrolysis Condition on Basic Group of Biochar and Amelioration of Acid Soil

ZHAO Mu-qiu;JIN Fan-li;SUN Zhao-wei;SHI Yun-feng;College of Biological Science and Technology,Qiongzhou University;Institute of Applied Ecology,Chinese Academy of Sciences;  
The effects of pyrolysis condition on basic group of biochar and the influence factors to improve pH of acid soil by biochar under different particle size of raw materials(0.5,0.25~0.5,0.25mm),different sources of biomass materials(coir dust sources,cassava source,eucalyptus source,swine manure source),different pyrolysis temperature(300,400,500,600℃)and different pyrolysis time(1,2,3,5h)were investigated.The result showed that all biochars under different pyrolysis condition were alkaline,the content of basic group was 0.40~1.05mmol/g.The basic group of different biomass materials was swine manure sourcecassava sourcecoir dust sourceseucalyptus source.The content of basic group increased with increasing of pyrolysis temperature,extending of pyrolysis time and decreasing of particle size of raw materials.It suggested that biochar could improve pH of acid soil significantly with increasing of the content of basic group.The improvement effects of acid soil increased with decreasing of particle size of raw materials,increasing of pyrolysis temperature,extending of pyrolysis time and increasing of biochar dosage.
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