Why temperate grasslands are so fertile?

Temperate grasslands are highly fertile due to their rich organic matter and nutrient-dense soils, which are formed from the decomposition of deep-rooted grasses. The climate, characterized by moderate rainfall and distinct seasons, supports the growth of diverse plant life, while periodic fires help to recycle nutrients and maintain soil health. Additionally, the extensive root systems of grasses improve soil structure and water retention, further enhancing fertility. These factors combined make temperate grasslands some of the most productive agricultural regions in the world.