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Influence of Pyrolysis Temperatures on FTIR Analysis, Nutrient Bioavailability, and Agricultural use of Poultry Manure Biochars

Zolfi Bavariani, Mokhtar, Ronaghi, Abdolmajid, Ghasemi, Reza
Communications in soil science and plant analysis 2019 v.50 no.4 pp. 402-411
Fourier transform infrared spectroscopy, acid soils, bioavailability, biochar, calcareous soils, carbonization, cation exchange capacity, copper, crops, electrical conductivity, iron, manganese, pH, poultry manure, pyrolysis, temperature, zinc
This study was conducted to investigate the effect of pyrolysis temperature on chemical properties of poultry manure (PM) biochar over the range of 200–500°C. Chemical properties of biochar produced at 200°C were almost the same as PM, but significant changes were observed in higher-temperature-produced biochars. According to elemental and fourier transformation infrared analyses, the degree of carbonization in biochar was accelerated with increasing pyrolysis temperature. Biochar yield decreased, while its pH, cation exchange capacity, and P, K, Fe, Mn, Zn, and Cu contents increased with increasing pyrolysis temperature. The biochar produced at 400°C or 500°C was highly alkaline. Also, due to high electrical conductivity, these types of biochars may not be suitable for salt-sensitive crops. It was concluded that the pyrolysis temperature of more than 300°C reduces the quality of PM biochar for use in calcareous soils, although it may be suitable for acidic soils or environmental application.