Mon, et al (2024) Residual Effects of Rice Husk 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 and Organic Manure Application after 1 Year on Soil Chemical Properties, Rice Yield, and Greenhouse Gas Emissions from Paddy Soils. Soil Systems. https://doi.org/10.3390/soilsystems8030091

A recent study explored the residual effects of rice husk biochar and organic manure on soil properties, crop yields, and greenhouse gas emissions in paddy soils. Conducted one year after biochar application, the research aimed to determine how different treatments impacted soil chemistry, rice production, and emissions of methane (CH4) and nitrous oxide (N2O).

The experiment was performed in two soil types: medium-fertility and low-fertility. Various treatments included biochar applied at rates of 5 and 10 t/ha, combined with either chicken manure or cow manure. After the initial year, the soils were only treated with chemical fertilizers to assess the long-term effects of the biochar and manure.

Results indicated that biochar, particularly when combined with chicken manure, 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, electrical conductivity, and nutrient levels. This treatment also resulted in the highest rice yields. However, it also caused increased CH4 emissions, raising concerns about its environmental impact. While biochar successfully reduced N2O emissions, the combination with organic manure led to a significant rise in CH4 emissions, potentially offsetting its benefits in greenhouse gas mitigation.

The study concluded that applying biochar in combination with organic manure could enhance crop productivity but requires careful management to minimize its environmental footprint, particularly concerning CH4 emissions. This research underscores the potential of biochar as a sustainable agricultural tool while highlighting the need for strategies to balance productivity gains with environmental sustainability.