In most soils, low-molecular-weight root exudates such as sugars and amino acids are largely consumed by soil microorganisms within hours to a few days after release.
NOT BSTOTAL BS
NOT BS — Verdict: True
Verified by Lenz ·
The Short Version
Available evidence strongly supports rapid microbial consumption of low-molecular-weight root exudates after release. Direct tracer experiments and multiple reviews indicate sugars and amino acids are typically taken up within hours and largely depleted within one to a few days in the rhizosphere. Slower turnover can occur in unusually harsh or microbially limited soils, but that does not overturn the claim’s “most soils” wording.
Caveats
The strongest direct measurements are rhizosphere-focused; the claim should not be read as describing bulk soil far from roots.
Turnover can be slower in cold, waterlogged, highly acidic, or severely nutrient-depleted soils where microbial activity is suppressed.
Some cited items are weak or non-peer-reviewed, but the conclusion is supported by stronger peer-reviewed studies and reviews.