Hay, et al (2024) The effect of olive pomace biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More on some characteristics of Vertisols. Irrigation and Drainage. DOI: 10.1002/ird.3017

Vertisols, known for their high clay content, shrink-swell behavior, and poor drainage, present challenges in agriculture, especially in areas like Çanakkale, Türkiye. A recent study explored the potential of olive pomace biochar (OB) as an amendment to improve these soils’ mechanical, physical, and chemical properties. The biochar was produced at 450°C and mixed into Vertisol at varying rates (0%, 3%, 6%, and 9%).

The study revealed that OB significantly improved several soil properties. Atterberg limits, which measure soil consistency, were enhanced by biochar application, particularly the liquid and plastic limits, suggesting improved workability. The plasticity index, which indicates the soil’s susceptibility to cracking, decreased with higher OB application.

Furthermore, saturated hydraulic conductivity (Ksat), which measures how easily water moves through soil, increased by up to 136% at higher biochar rates, demonstrating better water infiltration and drainage. Field capacity, total carbon (TC), and total nitrogen (TN) also increased, highlighting improved water retention and fertility.

The study concluded that OB positively affects Vertisol by reducing its swelling and cracking tendencies while improving water retention and nutrient content. However, the high application rates tested may not be feasible for large-scale farming. Future studies should focus on optimizing biochar application rates to enhance the practicality of this promising soil amendmentA soil amendment is any material added to the soil to enhance its physical or chemical properties, improving its suitability for plant growth. Biochar is considered a soil amendment as it can improve soil structure, water retention, nutrient availability, and microbial activity.   More.