Effect of different feedstock and pyrolysis temperature on some chemical and physical properties of biochar

Document Type : Research Paper


1 M.Sc. Student of Chemistry and soil fertility, Soil Science Department, Shahid Chamran University of Ahvaz, Iran

2 Associate Professor of Soil Science Department, Shahid Chamran University of Ahvaz, Iran.

3 Assistant Professor of Soil Science Department, Shahid Chamran University of Ahvaz, Iran

4 Assistant Professor of Soil Science Department, Shahid Chamran University of Ahvaz, Iran.


Organic residues processing and their reversion to soil is helpful to build up a sustainable agriculture. Biochar is product of organic residue pyrolysis. Biochar chemical and physical characteristics are significantly affected by pyrolysis temperatures and its feedstocks. Therefore an experiment was conducted to evalute some properties of biochar produced from four feedstocks viz: sugarcane bagasse, rice straw, wood sawdust and conocarpus leaves, which processed by three pyrolysis temperatures vis: 400, 700 and 900°‌C .The treatments replecated three time and laid out in a factorial experiment with the completely randomized design. Results showed that each group of treatments separatelye as well as their interaction had significantly different effect on biochar pH, EC,‌ CEC, specific surface area, C/N ratio and total element concentration as well as pb and cationic micro‌nutrients availability. Increasing the pyrolysis temperature from 400 to 900°‌C, decreased CEC in biochar drived from rice straw, conocarpus leaves, sugarcane bagasse and wood sawdust by 73/9, 37/7, 36/0 and 21/9 cmol+/kg, respectively. But increasing temperature from 400 to 900°‌C, improved specific surface area of bagasse, rice straw, sawdust and conocarpus leaves biochar by 153/3, 241/1, 283/9 and 21/2 m2/g, respectively. It is suggested that at pyrolysis temperatures of 400°‌C with prioritize of biochar derived from conocarpus leaves, 2- rice straw, 3- sugarcane bagasse and 4- wood sawdust can be used to improve cation exchange capacity as well as improving available nutrients reservoir.


Main Subjects

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