Organic fertilizer grows more helpful soil bacteria than chemical feed
Chamonara K, Masum MHU, Faria FF, Chowdhury S, Khan MSR
Soil Health
If you've ever wondered why compost-fed garden beds seem to bounce back faster after a bad season, this is part of the answer: the bacteria doing the nutrient recycling work are more abundant when you feed the soil instead of just the plant.
Scientists used advanced gene sequencing to peek at the bacteria living in farm soil that had been fertilized for years with either chemical or organic fertilizer. They found that organic amendments grew far more of the helpful bacteria that break down organic matter and cycle nutrients, like certain Bacillus and Gemmataceae species, while chemically fertilized soil had noticeably less of them.
Key Findings
Beta diversity analysis showed fertilization regime explained 84% of the variation in bacterial community composition (R2 = 0.84, p < 0.05)
Organic amendment nearly doubled Bacillus abundance (14.77% vs 8.44%) and raised Gemmataceae (11.60% vs 7.65%) compared to chemical fertilization (FDR < 0.001)
Xanthobacteraceae and Tumebacillus also rose under organic treatment (4.15% vs 2.88% and 2.73% vs 1.35%, respectively), while Bradyrhizobium and Paenibacillus stayed roughly similar between treatments
chevron_right Technical Summary
Long-term fertilizer choice reshapes the mix of bacteria living in farm soil, not just how many types are present. Organic fertilizer boosted beneficial, nutrient-cycling bacteria like Bacillus and Gemmataceae far more than chemical fertilizer did.
Abstract Preview
Original paper
Impact of extended fertilization on soil microbial diversity: a comparative full-length 16S rRNA amplicon analysis.
Soil bacterial communities are essential for regulating soil fertility, nutrient cycling, and agricultural sustainability. However, their responses to different fertilization regimes, especially in...
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