The study looked at how different levels of organic matter in Italian soils affect their ability to hold water for plants. They found that increasing organic matter doesn't always increase water capacity as previously thought. By using dynamic models, they discovered that the actual water supply capacity for plants was higher than expected and varied between different soil types. Future climate scenarios could decrease this capacity slightly, but organic matter levels didn't have a significant impact. The findings suggest that traditional measures of soil water capacity may not accurately reflect real conditions, and modeling is essential for understanding how soils will respond to climate change.