Document Type : Research Paper
Authors
1
Department of Soil Science, Faculty of agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
2
Department of Soil Sciences,, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran
3
Assistant Professor, Department of Soil Science, Faculty of agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
4
Researcher, Department of Agronomy, Khuzestan Sugarcane Research and Training Institute, Ahvaz, Iran
Abstract
This research aimed to investigate the effects of biochar derived from green sugarcane residues and biochars modified with FeCl2, ZnCl2, citric acid, and oxalic acid on some chemical and biological properties of a calcareous soil. The experiment was conducted in a completely randomized design with six treatments, including: 1- Control (C) (without biochar), 2- Unmodified biochar (B), 3- Biochar modified with citric acid (CAB), 4- Biochar modified with oxalic acid (OXB), 5- Biochar modified with ZnCl2 (ZnB), and 6- Biochar modified with FeCl2 (FeB), with three replications. The biochar was prepared at 350°C and, after chemical modification, mixed with 300 grams of soil at a rate of 1%. The samples were maintained at a constant temperature (25±2°C) for three months. At the end of the experiment, some chemical and biological properties of the soil were measured. The results showed that the application of biochars led to a decrease in soil pH (0.03-0.66 units), an increase in electrical conductivity (0.13-0.57 units), cation exchange capacity (17.0-43.9%), total organic carbon (2.21-2.29-fold), available phosphorus concentration (52.1-96.2%), soil microbial respiration (42.9-69.3%), and soil microbial biomass carbon (54.2-93.7%). Among these, the biochar treatment modified with citric acid had the most positive impact on the examined properties. Overall, biochar derived from green sugarcane residues and modified with citric acid could be effective in the soil organic matter, phosphorus availability, and soil biological properties under the studied soil conditions.
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