Chinese researchers tested micro-nano bubble aeration in waterlogged rice paddies and found oxygen bubbles cut methane emissions by 60.6% while improving soil nutrient availability. The 40-day pot trial compared air and oxygen bubbles, with oxygen treatments raising soil redox potential from 230 to 374 mV, lowering toxic reducing substances, and nearly doubling available phosphorus. Total global warming potential still dropped 26.2% even though CO2 emissions rose, because the methane cut dominated the combined impact. Unlike lime or chemical oxidants, the method uses only air and oxygen, leaves no residue, and can be applied through existing irrigation systems. The researchers say the low-cost approach could help scale low-carbon rice production across southern China, where waterlogged soils cut yields by 30-50% and drive methane release. Field trials and energy use data will determine whether the technology works beyond pots.
