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Biochar addition influences C and N dynamics during biochar co-composting and the nutrient content of the biochar co-compost. | LitMetric

AI Article Synopsis

  • - This study explored how adding corn cob biochar (CCB) and rice husk biochar (RHB) at different levels affects nitrogen and carbon dynamics during the composting of chicken litter, rice straw, and household waste.
  • - The results revealed that biochar addition lowered ammonia and nitrate levels while boosting beneficial bacteria and fungi populations, resulting in nutrient-rich co-composts with higher pH and mineral content compared to those without biochar.
  • - The composts containing biochar showed minimal to no harm to the germination of crops like amaranth, cucumber, and cowpea, indicating they are safe and effective soil amendments for enhancing crop growth.

Article Abstract

This study investigated the effects of corn cob biochar (CCB) and rice husk biochar (RHB) additions (at 0%, 5%, and 10% w/w) on nitrogen and carbon dynamics during co-composting with poultry litter, rice straw, and domestic bio-waste. The study further assessed the temperature, moisture, pH, and nutrient contents of the mature biochar co-composts, and their potential phytotoxicity effects on amaranth, cucumber, cowpea, and tomato. Biochar additions decreased NH-N and NO- contents, but bacteria and fungi populations increased during the composting process. The mature biochar co-composts showed higher pH (9.0-9.7), and increased total carbon (24.7-37.6%), nitrogen (1.8-2.4%), phosphorus (6.5-8.1 g kg), potassium (26.8-42.5 g kg), calcium (25.1-49.5 g kg), and magnesium (4.8-7.2 g kg) contents compared to the compost without biochar. Germination indices (GI) recorded in all the plants tested with the different composts were greater than 60%. Regardless of the biochar additions, all composts treatments showed no or very minimal phytotoxic effects on cucumber, amaranth and cowpea seeds. We conclude that rice husk and corn cob biochar co-composts are nutrient-rich and safe soil amendment for crop production.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11466957PMC
http://dx.doi.org/10.1038/s41598-024-67884-zDOI Listing

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