Farming Method Effects on Soil Microbes and Emissions: Organic and Natural Systems Show Lower Carbon Footprint

A new research synthesis covering 118 studies from 2015 to 2024 finds clear differences in how conventional, organic, and natural farming affect soil microbes and greenhouse gas emissions. Conventional farming with intensive tillage and synthetic inputs was linked to reduced microbial diversity and higher emissions from residue burning and nitrogen fertilizers. Organic and natural farming generally supported richer soil communities and lower nitrous oxide emissions, though organic rice paddies can produce comparable methane levels to conventional systems. Natural farming research remains heavily concentrated in India, and the evidence base is newer and smaller. The study highlights that residue burning in India rose from 19.34 to 33.83 teragrams of CO2 equivalent annually between 2011 and 2020. The authors call for long-term field trials that measure yield, soil carbon, and emissions together, especially for rice systems where methane and nitrous oxide trade-offs matter. This work is useful for anyone looking at agricultural carbon credits or soil health programs, as it points to which practices might genuinely reduce emissions.