|Title||Comparative assessment of biochar stability using multiple indicators|
|Author(s)||Jindo, Keiji; Sonoki, Tomonori|
|Source||Agronomy 9 (2019)5. - ISSN 2073-4395|
|Department(s)||Plant Production Systems|
|Publication type||Refereed Article in a scientific journal|
|Keyword(s)||Biochar - Pyrolysis - Rice husk - Rice straw - Stability|
Biochar application is one strategy proposed to improve carbon sequestration in soil. Maintaining high carbon content in soil for a long period requires stable biochar. In this work, we assessed biochar stability by two methodologies, i.e., laboratory incubation and chemical oxidation. Biochar was produced at four different temperatures (400 °C, 500 °C, 600 °C, and 800 °C) from rice (Oryza sativa L.) straw and husk, applewood branch (Malus pumila), and oak (Quercus serrata Murray) residues. Results showed that the high-temperature biochars were more stable in both abiotic and biotic incubations, whereas the low-temperature biochars had reduced longevity. In addition, we showed biochars originated from woody material have higher stable carbon than those produced from rice residues. Finally, the oxidative assessment method provided a more reliable estimation of stability than the biotic incubation method and showed a strong correlation with other stability indicators.