Objective The effects of biochar on carbon and nitrogen mineralization of organic fertilizer were studied to provide a theoretical basis for the rational utilization of organic material in the tobacco fields.
Method The release dynamics of carbon and nitrogen from the organic fertilizer, as well as the diversity of microbial function, were analyzed through an in-situ culture method using nylon bags in the field.
Result Adding exogenous biochar to organic fertilizer boosted the mineralization of organic carbon and nitrogen, raising their cumulative mineralization rates by 3.02 and 6.18 percentage points, respectively, after 100 days in the ground. Exogenous biochar enhanced the functional activity and McIntosh diversity index of soil microorganisms treated with organic fertilizer, and increased their utilization of amino acids, phenolic acids, and amines, while decreasing carbohydrate usage.
Conclusion The incorporation of exogenous biochar has the potential to enhance the mineralization of organic fertilizers, thereby enhancing nutrient release and increasing microbial activity and diversity. The strategic combination of organic fertilizers and biochar can optimize soil nutrient availability, ultimately achieving the objectives of improving both the quality and efficiency of tobacco production.
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