Charcoal-like soil additive doubles down on mint fertilizer benefits
Soliman YM, Soliman WS
Soil Health
If you've ever struggled with sandy or fast-draining soil letting water and fertilizer run right through, this study shows a simple carbon-rich amendment can hold nutrients in place long enough for herbs like mint to actually use them.
Sandy soil is terrible at holding onto water and plant food, which makes growing anything there a challenge, especially in hot, dry climates. Researchers tried mixing biochar, a charcoal-like material made from burning organic matter without much oxygen, into sandy fields growing spearmint. Plants getting both biochar and regular fertilizer grew bigger, made more essential oil, and absorbed more nutrients than plants getting either treatment alone, and the combination worked better than simply adding the two effects together.
Key Findings
Combining biochar (12.5 ton/ha) with NPK fertilizer (5 g/L) produced the highest values across all measured traits, exceeding the sum of each treatment's individual effects.
Biochar alone consistently outperformed mineral NPK fertilizer alone for growth, yield, and essential oil production.
Biochar treatments significantly increased leaf nitrogen, phosphorus, and potassium content plus chlorophyll b levels over two growing seasons (2024-2025).
chevron_right Technical Summary
Adding biochar to sandy soil, especially alongside standard fertilizer, dramatically boosted growth, leaf nutrients, and essential oil yield in spearmint, offering a low-cost fix for farmers stuck with poor, leaky desert soils.
Abstract Preview
Original paper
Enhancing fertilizer use efficiency in Mentha spicata L. through biochar-based integration with NPK in sandy soils.
Sandy soils are widely distributed in Egypt and are characterized by poor physical properties and a limited capacity to retain irrigation water and nutrients, which severely constrains agricultural...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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Spearmint, also known as garden mint, common mint, lamb mint and mackerel mint, is native to Europe and southern temperate Asia, extending from Ireland in the west to southern China in the east. It is naturalized in many other temperate parts of the world, including northern and southern Africa, ...