In a comprehensive scientific review published in the journal Crop Health, lead author Daniele Borgatti and a diverse group of international researchers synthesized agricultural data compiled between the years 1999 and 2025 to evaluate the effectiveness of adding stable carbon materials to fragile Mediterranean farming systems. Farmlands across the Mediterranean basin face severe risks from accelerating desertification, rising ambient temperatures, persistent droughts, and rapid depletion of organic matter. The scientific synthesis focused heavily on understanding how adding this specialized, dark carbon material alters crop health, soil composition, and general greenhouse gas patterns. By gathering extensive datasets from decades of field research, the authors established clear patterns demonstrating that these soil amendments can act as reliable foundations for modern climate-smart agriculture, provided that farmers deploy them under precise management conditions rather than utilizing blanket applications across all fields.

The ultimate success of this agricultural practice relies heavily on context and specific soil characteristics. The reviewed research indicates that the material performs exceptionally well when applied to heavily degraded, coarse-textured, or sandy soils where natural water retention and nutrient capacities are fundamentally limited. When mixed into these challenging environments, the amendment alters the physical layout of the earth by lowering total bulk density, increasing general porosityPorosity of biochar is a key factor in its effectiveness as a soil amendment and its ability to retain water and nutrients. Biochar’s porosity is influenced by feedstock type and pyrolysis temperature, and it plays a crucial role in microbial activity and overall soil health. Biochar More, and protecting essential moisture during extended periods of summer drought. Chemically, the material provides a high cation exchange capacity that significantly limits the leachingLeaching is the process where nutrients are dissolved and carried away from the soil by water. This can lead to nutrient depletion and environmental pollution. Biochar can help reduce leaching by improving nutrient retention in the soil.   More of vital plant nutrients like nitrogen and potassium. These improved physical and chemical characteristics create a supportive home for beneficial rhizosphere microorganisms, including plant growth-promoting rhizobacteria and arbuscular mycorrhizal fungiThese are friendly fungi that form a partnership with plant roots. They act like an extension of the root system, helping plants access water and nutrients more effectively. Biochar can create a cozy habitat for these helpful fungi, boosting their growth and improving plant health.   More, which collectively help crops absorb minerals and endure high soil salinity.

Despite these clear agronomic advantages, the data reveals complex environmental dynamics and potential risks regarding overall greenhouse gas fluxes. While the material remains highly stable and keeps carbon dioxide emissions entirely neutral, its influence on other trace gases depends heavily on regional weather and moisture. On the positive side, the amendment limits nitrous oxide emissions by thirty to seventy percent because its unique surfaces absorb ammonium and nitrate ions, thereby preventing these compounds from converting into volatile atmospheric gases. However, when the amendment is added to fine-textured or poorly drained fields that become completely saturated during warm, wet autumn and winter seasons, it forms tiny, oxygen-depleted zones within its porous framework. These localized anaerobic pockets stimulate methanogenic microflora, causing a problematic increase in methane release that can partially counteract the global warming mitigation achieved via underground carbon storage.

Crop species also exhibit widely differing levels of sensitivity to these soil interventions. Long-term perennial systems, most notably olive orchards and vineyards, display the most consistent improvements in health and longevity. Field trials show that a single application can improve grapevine water status, stomatal opening, and natural drought tolerance for more than a full decade, thereby maximizing the initial financial investment. Legumes like faba beans, cowpeas, and fenugreek also respond with higher seed yields and improved oil content because the amendment aids biological nitrogen fixationNitrogen is a crucial nutrient for plant growth, but plants can’t directly absorb it from the air. Nitrogen fixation is a process where certain bacteria convert atmospheric nitrogen into a form that plants can use. Biochar can provide a home for these nitrogen-fixing bacteria, enhancing More. Conversely, annual field crops like durum wheat and various leafy vegetables show highly variable or even negative reactions, particularly during early growth stages. If the carbon material is applied to highly fertile fields without supplemental fertilizers, it can temporarily lock away available nitrogen and phosphorus, leading to reduced early shoot development and lower overall yields. Therefore, maximizing the ecological and financial value of this strategy requires strategic, moderate applications combined with cover crops or organic fertilizers.

Source: Borgatti, D., Radicetti, E., Mancinelli, R., Coluccia, L., Allam, M., Jamal, A., Abideen, Z., Ahsan, M., & Ben Hassine, M. (2026). Carbon farming strategies for mediterranean agriculture: the role of biochar in climate-smart agroecosystems. Crop Health, 4(19), 1-15.