Increasing soil organic matter (SOM) enhances crop productivity and reduces yield variability. This study, examining nine U.S. farms, found that unstable yield areas had higher particulate organic matter (POM) than stable ones. While mineral-associated organic matter (MAOM) was linked to productivity and soil properties, POM was influenced by decomposition patterns. These findings suggest SOM alone may not ensure yield stability and highlight the role of POM as an indicator of yield stability.
