Composting alone destroys drug-resistant bacteria in manure, no biochar needed
Agga GE, Netthisinghe A, Woosley P, Strunk W, Sistani KR
Composting
If you use composted manure to feed your vegetable beds, this research shows the composting process itself is doing the heavy lifting of killing off dangerous drug-resistant bacteria, so you don't need to pay extra for a biochar additive to get safer fertilizer.
Farmers often mix charcoal-like biochar into composting manure, hoping it helps kill harmful bacteria before the compost goes on fields. This study found biochar doesn't actually add any extra benefit: plain composting for six months already eliminates the nastiest antibiotic-resistant bacteria on its own. The season matters more than the biochar though, since composting in spring and summer worked better than composting in fall and winter.
Key Findings
Composting eliminated E. coli resistant to 3rd-generation cephalosporins and ESBL-producing E. coli, both classified as critically important for human health
Biochar amendment showed no significant reduction in bacterial load beyond what composting alone achieved
Spring-summer composting was more effective than fall-winter composting, and gram-negative bacteria (like E. coli) died off more readily than gram-positive enterococci
chevron_right Technical Summary
Composting dairy manure for six months wipes out the most dangerous antibiotic-resistant bacteria, including strains resistant to critical human antibiotics, and adding biochar to the mix doesn't help beyond what composting already does on its own.
Abstract Preview
Original paper
Composting dairy cattle manure significantly reduces antibiotic-resistant bacteria with no biochar impact.
In two randomized controlled field studies, we investigated the effect of biochar-amended dairy manure composting on the concentrations and prevalence of generic and antibiotic-resistant E. coli an...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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