Synergistic role of de-ashed biochar and compost on lettuce (
Majrashi MA, Khan A
Soil Health
If your raised bed soil has ever been compacted, over-fertilized, or near an old painted structure, this soil amendment duo — compost plus treated biochar — is the kind of low-cost fix that could meaningfully improve what your lettuce actually absorbs from the ground up.
Researchers grew lettuce in pots with soils spiked with salt or lead — two common stressors in dry, heavily farmed regions — then treated those soils with a mix of specially processed charcoal (biochar) and compost. The plants in treated soil were greener, grew faster, and pulled far less lead into their leaves. The soil itself also became richer in nutrients that plants need, suggesting this pairing works both ways: helping the plant and healing the ground.
Key Findings
Co-applying de-ashed biochar and compost increased lettuce photosynthesis by 18.49% and stomatal conductance by 55.24% under salt stress.
Lead accumulation in lettuce leaves dropped by 17.61% and in roots by 20.68% with the biochar-compost amendment.
Stress markers — including electrolyte leakage, carotenoids, and proline — fell by roughly 20–29% under both salt and lead stress conditions.
chevron_right Technical Summary
Adding a combination of de-ashed biochar and compost to contaminated, salty soils significantly improved lettuce growth, reduced lead uptake by plants, and boosted soil nutrient availability — offering a practical, low-tech soil rehabilitation strategy for degraded farmland.
Abstract Preview
Soil salinity and lead (Pb) toxicity severely degrade soil health and crop productivity in arid regions. This study investigated the combined use of deashed biochar (DAB) and compost (COM) to allev...
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