Scientists Uncover the Secret "Glue" That Helps Soil Hold Water

Northwestern University researchers uncovered a molecular process that helps soils retain water.

They found that carbohydrates act like a molecular adhesive, linking organic matter and soil minerals using water.

These microscopic links trap moisture that would otherwise evaporate, explaining water retention at the micro scale.

The mechanism clarifies why adding organic material to soil improves water-holding—observed by farmers and gardeners.

The study, published in PNAS Nexus, may also help explain how water has remained locked inside rocks for billions of years.