Biochar Application Reduces Greenhouse Gas Emissions in Salt-Affected Sorghum Farmland

Researchers in China have conducted a two-year field study to assess the influence of corn straw-derived biochar on greenhouse gas emissions in arid saline farmland. The study, funded by several organizations, including the National Natural Science Foundation of China and the National Key Research and Development Program of China, aimed to explore the role of soil physicochemical properties in regulating greenhouse gas fluxes.

The study found that the application of biochar at a rate of 15 tons per hectare significantly reduced carbon dioxide and nitrous oxide emissions, while increasing sorghum grain yield. The results also showed that soil temperature was the primary determinant of carbon dioxide flux, and that biochar application enhanced the yield of sorghum grain. The study's findings have significant implications for reducing greenhouse gas emissions in agricultural settings.

Key Takeaways:

• The study found that biochar application reduced carbon dioxide emissions by 15.2% and seasonal carbon dioxide flux by 77.0% compared to the control group.
• The application of biochar at a rate of 15 tons per hectare decreased greenhouse gas emissions by 76.5-106.7% and 5.3-56.1% compared to the control group, respectively.
• The study's results showed that biochar application enhanced sorghum grain yield and that soil temperature was the primary determinant of carbon dioxide flux.
• Multivariate structural equation modeling identified soil moisture and soil temperature as primary negative regulators of nitrous oxide fluxes.
• The study concluded that the application of biochar at a rate of 15 tons per hectare reduced nitrous oxide emissions and increased sorghum yield.

Statistics:

• 15.2% reduction in carbon dioxide emissions with biochar application at a rate of 15 tons per hectare.
• 77.0% seasonal reduction in carbon dioxide flux with biochar application.
• 76.5-106.7% decrease in greenhouse gas emissions with biochar application at a rate of 15 tons per hectare.
• 5.3-56.1% decrease in greenhouse gas emissions with biochar application at a rate of 30 tons per hectare.
• 15 tons per hectare: biochar application rate that significantly reduced carbon dioxide and nitrous oxide emissions.

Sources:

• Regulation of CH [ [4] ] and N [ [2] ] O Emissions by Biochar Application in a Salt-Affected Sorghum Farmland. Agriculture, 2025,15(15):1592.
• Inner Mongolia Agricultural University, College of Water Conservancy and Civil Engineering.
• Yibo Zhao, Wei Yang, Zhongyi Qu, Liping Wang, Yixuan Yang, Yusheng Hao.