Shwe, et al (2024) Mitigation of Soil Salinity by Addition of Different Rice Straw 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 Doses in Salt-affected Acid Soil. [Submitted Manuscript]

A recent study explored the effectiveness of rice straw biochar in alleviating salinity, acidity, and sodicity in salt-affected acid soils. The experiment assessed different biochar application rates—0%, 1%, 3%, and 5%—on six soil samples with varying salinity levels. Biochar significantly improved soil 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 and electrical conductivity (ECe), indicating better soil conditions with increasing biochar concentrations. At a 1% biochar application rate, sodium adsorption ratio (SAR) and exchangeable sodium percentage (ESP) fell below critical sodicity levels, while soluble and exchangeable sodium (Na+) levels decreased. Additionally, potassium (K+), essential for rice plant growth, increased in availability.

Biochar also demonstrated its ability to reduce soil toxicity by lowering chloride (Cl–) and sodium content. These changes in soil chemistry enhance the soil’s capacity to support plant growth, particularly rice, which is sensitive to high salinity and acidity. The study concluded that a 1% biochar application is an optimal rate to reduce acidity, toxicity, and sodicity, improving overall soil health for rice cultivation. These findings suggest that biochar offers a sustainable solution for managing saline, acidic soils, though further field trials are needed to confirm its effects on rice yield.