| Popis: |
The main aim of this study is to determine the physical and chemical properties of biochar made from different raw materials (straw rice, sawdust, sugar cane, and tree leaves) at different pyrolysis temperatures (400, 600, and 800°C). Moisture content, water holding capacity, bulk density, and porosity were the measured physical properties; pH, Electrical Conductivity (EC), organic matter, organic carbon, total nitrogen, potassium, phosphorus, calcium, magnesium, sodium, and sulfur were the analyzed chemical properties. The results show that the biochar yield decreased with increasing pyrolysis temperature, and the values of the analyzed properties varied depending on the type of biochar and pyrolysis temperature. The moisture content ranged from 1.11–4.18%, and the water holding capacity ranged from 12.9 to 27.6 g water g− 1 dry sample. The bulk density ranged from 161.5 to 211.9 kg m− 3. The porosity values ranged from 45.9–63.7%. The pH ranged from 6.6 to 10.4, and EC ranged from 0.82 to 3.46 dS m− 1. Total organic matter ranged from 66.0–98.1%; total organic carbon ranged from 38.3–56.9%, and total nitrogen ranged from 0.4–1.9%. The ranges of phosphorus and calcium content were 47.6–134.6 and 241.3–649.0 mg kg− 1, respectively. The magnesium, sodium, and sulfur content had ranges of 10.9–51.7, 1124–1703, and 3568–12060 mg kg− 1, respectively. |
