Sun, et al (2024) Long term comparison of GHG emissions and crop yields in response to direct straw or 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 incorporation in rice-wheat rotation systems: A 10-year field observation. Agriculture, Ecosystems & Environment. https://doi.org/10.1016/j.agee.2024.109188

A study published in Agriculture, Ecosystems & Environment compared the long-term effects of straw and biochar incorporation on greenhouse gas emissions and crop yields in a rice-wheat rotation system over ten years. Researchers examined three treatments: direct straw incorporation with chemical fertilizer (SCF), biochar incorporation with chemical fertilizer (BCF), and chemical fertilizer alone (CF). The findings revealed that both SCF and BCF achieved similar rice yields to CF, while wheat yields showed no significant difference between SCF and BCF.

However, the treatments had different impacts on greenhouse gas emissions. SCF increased methane (CH4) emissions by 144% and reduced nitrous oxide (N2O) emissions by 40%, resulting in an 80% increase in annual global warming potential (GWP) compared to CF. In contrast, BCF reduced CH4 emissions by 58% and N2O emissions by 25% during the rice season, leading to a 51% reduction in annual GWP compared to SCF. Over time, BCF’s CH4 emissions became lower than those of CF.

These results suggest that converting straw to biochar before incorporation into the soil could effectively mitigate greenhouse gas emissions while maintaining crop yields. This practice could offer a sustainable alternative to direct straw incorporation in rice-wheat rotation systems, addressing both environmental and agricultural productivity concerns.