de Melo, et al (2024) Interaction of chemical attributes of a Regossol cultivated with beans and fertilized with 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. Scientia Plena. doi: 10.14808/sci.plena.2024.060201

As the global population is expected to reach 10 billion by 2050, the demand for food is rising, driving farmers to adopt technologies that boost crop productivity. Synthetic fertilizer costs are also increasing, making organic matter, such as biochar, a viable alternative for soil enhancement. This study evaluates biochar’s effectiveness, produced from sewage sludge, in improving the chemical attributes of soil and its impact on bean cultivation in Pernambuco, Brazil.

The experiment analyzed the chemical composition of soil layers treated with various biochar dosages, synthetic fertilizers, chicken manure, and sewage sludge. Biochar was tested at rates of 5, 10, 20, and 40 tons per hectare. The principal component analysis (PCA) revealed that in the topsoil layer (0-0.1 m), the first principal component (PC1) explained 71.82% of data variability, influenced by key nutrients such as potassium (K), phosphorus (P), magnesium (Mg), sulfate (SO4^2-), total organic carbon (TOC), and nitrogen (N). In this layer, higher biochar doses (20 and 40 t/ha) significantly enhanced nutrient availability, mirroring the effects of chicken manure.

In the subsoil layer (0.1-0.2 m), PC1 accounted for 84.39% of data variability, with all soil chemical variables contributing. Here, biochar also improved soil chemical properties and stabilized pHpH is a measure of how acidic or alkaline a substance is. A pH of 7 is neutral, while lower pH values indicate acidity and higher values indicate alkalinity. Biochars are normally alkaline and can influence soil pH, often increasing it, which can be beneficial More levels, essential for healthy bean growth. PC2, influenced by magnesium concentrations, highlighted interactions between Mg availability and other soil nutrients.

The findings underscore biochar’s potential to enhance soil fertility and productivity sustainably. Its application, especially at higher dosages, can significantly benefit rainfed agriculture in regions like Agreste of Pernambuco, supporting higher crop yields and reducing reliance on synthetic fertilizers. This study demonstrates biochar’s role as a 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 for sustainable agricultural practices.