Decades of compost use rewires paddy soil's microbial workforce
Li Z, Li M, He X, Zhang H, Feng C
Soil Health
If you've ever top-dressed a vegetable bed with compost instead of synthetic fertilizer, this long-term study shows that habit slowly trains soil microbes to hold onto and recycle nutrients on their own, so the payoff compounds over years, not weeks.
Scientists tracked a rice field for 43 years, comparing plots fed only chemical fertilizer against plots where some of that fertilizer was swapped for organic matter like compost or manure. The organic-fed soil ended up with a more balanced, stable community of microbes that naturally released nitrogen from organic matter and cycled sulfur more efficiently, instead of relying on random chance to shape which microbes showed up. In short, feeding the soil, not just the plant, builds a self-sustaining nutrient recycling system underground.
Key Findings
Organic substitution increased microbial community evenness while keeping species richness stable, and reduced random (stochastic) community assembly in favor of more deterministic processes.
Keystone microbial groups shifted toward Actinomycetota (Thermoleophilia), Myxococcota, and Gemmatimonadota, which became central hubs in the soil's microbial network.
Organic amendments upregulated genes for organic nitrogen mineralization and anammox while downregulating nitrification and nitrate reduction pathways, and boosted assimilatory sulfate reduction while reducing sulfide-producing sulfur mineralization.
chevron_right Technical Summary
A 43-year rice paddy experiment found that replacing part of the chemical fertilizer with organic amendments (like compost or manure) reshapes the soil's microbial community, making it more stable and better at cycling nitrogen and sulfur naturally, which could mean less reliance on synthetic fertilizer over time.
Abstract Preview
Original paper
Forty-three years of partial organic substitution shapes microbial assembly and multifaceted network stability in a paddy soil.
Partial substitution of chemical fertilizers with organic amendments is a promising strategy to sustain soil productivity while reducing chemical inputs. However, the ecological mechanisms by which...
open_in_new Read full abstractAbstract copyright held by the original publisher.
Species Mentioned
Was this useful?
Want to tell us more? (optional)
Thanks for the note!
Something went wrong — please try again.
Too many submissions. Try again in an hour.
Gene editing removes 97% of celiac-triggering proteins from bread wheat
It could mean that people with celiac disease — roughly 1 in 100 worldwide — may one day safely eat bread made from real wheat, without sacrificing the taste...
Rice is a cereal grain and in its domesticated form is the staple food of over half of the world's population, particularly in Asia and Africa. Rice is the seed of the grass species Oryza sativa —or, much less commonly, Oryza glaberrima. Asian rice was domesticated in China some 13,500 to 8,200 y...