A recent study published in the Archives of Agriculture and Environmental Science explores the agronomic benefits of 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, a carbon-rich 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, on kidney bean cultivation in Nepal. The research tested biochar made from rice husk and sawdust at three pyrolysisPyrolysis is a thermochemical process that converts waste biomass into bio-char, bio-oil, and pyro-gas. It offers significant advantages in waste valorization, turning low-value materials into economically valuable resources. Its versatility allows for tailored products based on operational conditions, presenting itself as a cost-effective and efficient More temperatures: 200°C, 400°C, and 600°C.

Key findings include:

1. Biochar Properties: Lower pyrolysis temperatures (200°C) produced higher yields of biochar, while higher temperatures resulted in biochars with greater surface area and carbon stability. Rice husk biochar contained more ashAsh is the non-combustible inorganic residue that remains after organic matter, like wood or biomass, is completely burned. It consists mainly of minerals and is different from biochar, which is produced through incomplete combustion.   Ash Ash is the residue that remains after the complete More, while sawdust biochar exhibited higher volatile matterVolatile matter refers to the organic compounds that are released as gases during the pyrolysis process. These compounds can include methane, hydrogen, and carbon monoxide, which can be captured and used as fuel or further processed into other valuable products.   More.
2. Crop Growth and Yield: Sawdust biochar at 400°C (SD400) showed the best results, producing the tallest plants and the heaviest fruit pods. In general, biochar treatments increased kidney bean yields by 19-28% compared to the control, with no significant differences between rice husk and sawdust biochars.

The study highlights that biochar, when combined with cattle manure, improves soil properties and enhances plant growth through increased nutrient retention and availability. While results are promising, further research is needed to assess its effectiveness across different soils and crops.

Biochar production from agricultural residues offers a sustainable way to boost soil fertility and crop yields in Nepal, particularly in nutrient-depleted soils, while also contributing to carbon sequestration.

SOURCE: Aryal, et al (2024) Assessment of biochar quality and agronomic efficiency produced from rice-husk and saw-dust at different temperature regimes. Archives of Agriculture and Environmental Science. https://doi.org/10.26832/24566632.2024.090405