The biome with the richest soil is temperate grasslands. These regions are known for their fertile soil, which is rich in organic matter. The decomposition of grasses and other plants contributes to the high nutrient content in the soil. This makes temperate grasslands ideal for agriculture.
In contrast, savannas and tropical rainforests have less fertile soil. In savannas, the soil is often nutrient-poor due to frequent fires and grazing. Tropical rainforests, despite their lush vegetation, have thin and nutrient-poor soil because the nutrients are quickly recycled by the dense plant life.
Tundra biomes have the least fertile soil. The cold climate slows down decomposition, resulting in a thin layer of soil with low nutrient content.