Boosting salinity resilience and silymarin production in Silybum marianum: a sustainable strategy using mango-residue biochar and foliar α-tocopherol.
Youssef SM, Mohamed IAA, Rateb YSH, Hassanain MA, Hassan ME
Soil Health
Charcoal made from fruit-processing scraps — the kind piling up behind juice factories — can rehabilitate salt-poisoned farmland well enough to grow high-quality medicinal herbs on soil most growers have written off.
Milk thistle is a spiky medicinal plant prized for a liver-protective compound called silymarin, but salty soil stunts its growth and weakens its medicine. Scientists mixed charcoal made from mango pits and peels into saline soil and sprayed plants with vitamin E — and both the plants and their medicinal potency bounced back significantly. The neatest part is that the charcoal is made from fruit-processing waste, turning a disposal problem into a soil-healing resource.
Key Findings
The optimal combination of 10 t/ha mango-residue biochar plus 150 ppm foliar vitamin E significantly increased both above- and below-ground biomass compared to untreated controls grown in saline soil (ECe = 8.55 dS m⁻¹).
The combined treatment enhanced silymarin content — the primary pharmaceutical compound in milk thistle — more than either biochar or vitamin E applied alone, demonstrating a measurable synergistic effect.
Improved nutrient uptake (N, P, K) under salt stress was identified as a key mechanism, suggesting the biochar improved soil chemistry enough to restore normal plant feeding in otherwise hostile conditions.
chevron_right Technical Summary
Researchers found that mixing mango-waste charcoal into salty soil and spraying milk thistle plants with vitamin E dramatically improved plant growth and the concentration of silymarin, the medicinal compound milk thistle is grown for. The combined treatment outperformed either approach alone, suggesting a practical, waste-reducing strategy for farming on degraded saline land.
Abstract Preview
Soil salinity (ECe=8.55 dS m-1), a predominant abiotic stress factor, significantly impairs the growth, yield and pharmaceutical quality of the medicinal plant Silybum marianum (milk thistle). This...
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Silybum marianum is a species of thistle. It has various common names including milk thistle, blessed milkthistle, Marian thistle, Mary thistle, Saint Mary's thistle, Mediterranean milk thistle, variegated thistle and Scotch thistle. This species is an annual or biennial plant of the family Aster...