California officials say state data have shown that wildfire contamination can extend deeper than 6 inches, contradicting FEMA's claims.

Soils are becoming severely degraded due to a combination of intensive farming practices and natural processes. As the layer of fertile topsoil thins, it gets increasingly difficult to grow crops ...

both near the surface and in deeper soil layers, by promoting plant diversity and increasing the amount of biomass allocated to roots. Grasslands dominated by plants that depend on mycorrhizal ...

The layer of organic matter on top will also slow evaporation of moisture from the soil and keep the moisture levels more consistent during dry spells. Beneficial microscopic organisms in the soil ...

Today, the soil is dark and full of large clumps, with bigger gaps between the particles. Water is now able to reach the deeper layers of the ground. “When you walk across my fields, it feels ...

However, in the 1990s, a growing number of farmers, including those in Lishu county, Jilin province, a major maize-producing county, found that the black soil was revealing yellow layers ...