In a recent study published in Agronomy, researchers Yanbing Chi and colleagues the influence 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 and water management on greenhouse gas (GHG) emissions from paddy fields. The study reveals that the irrigation regime, specifically flooded irrigation versus alternate wetting and drying (AWD), plays a more significant role in controlling GHG emissions than biochar application.  

Biochar has been widely studied for its potential to improve soil fertility and regulate GHG emissions. However, its effectiveness can be influenced by soil moisture conditions. To better understand this interplay, the researchers conducted a laboratory incubation experiment, manipulating biochar application rates and irrigation regimes.  

The study’s results indicate that different irrigation methods significantly impact GHG emissions. Specifically, alternate wetting and drying (AWD) increased nitrous oxide (N2O) emissions but decreased methane (CH4) emissions compared to flooded irrigation. Overall, AWD led to a reduction in the soil’s global warming potential (GWP).  

Biochar amendment increased soil organic carbon (SOC) and total nitrogen (TN) contents, enhanced soil enzyme activities, and improved microbial carbon use efficiency. However, biochar had no significant effect on soil N2O and carbon dioxide (CO2) emissions, while it did suppress CH4 emissions.  

The study also found that the impact of biochar on GWP varied over time. In the initial stage, higher biochar application rates increased GWP, but in the later stage, biochar application reduced GWP.   The researchers conclude that integrating biochar application with AWD irrigation can optimize soil carbon use efficiency, improve soil nutrient supply, and partially offset the increase in GHG emissions caused by biochar.  

Source: Chi, Y.; Wang, Y.; Li, Y.; Yan, C.; Shi, M.; Fan, L.; Wei, C. Dominant Role of Irrigation Regime over Biochar in Controlling GHG Emissions from Paddy Fields. Agronomy 2025, 15, 1127.