Temperature Effects on Properties of Rice Husk Biochar and Calcinated Burkina Phosphate Rock

Rice husk biochar (RHB) and phosphate rock (PR) are locally accessible resources that poor farmers in Sub-Saharan Africa (SSA) can utilize to increase rice productivity. However, biochars variable depending on feedstock, pyrolysis temperature, duration. Phosphate rocks from SSA of low solubility. The goal this study was determine whether (RH), calcination PR, the calcination/pyrolysis a RHB-PR mixture at 300 °C, 500 700 °C formic acid (FA)- extractable phosphorous (P). properties these RHBs were compared RHB produced through simple farmer-friendly technique termed “Kun-tan”. Properties calcinated PR also raw PR. Quartz formed amorphous SiO2 during RH dominant mineral phase biochars, irrespective temperature. Formic acid-extractable P content, pH, ash content increased with increasing At FA-extractable 219% more than feedstock. Hydroxyapatite quartz minerals indicating hydroxyapatite stable least °C. Rather, decreased