What is the most fertile soil type?

Fertile soil contains a large number of different elements that have a positive effect on plant growth. At the heart of fertile soils is humus. Due to the constant use of the soil, it becomes less fertile. It is necessary to monitor them so that they do not lose their useful qualities. The most fertile soils are alluvial soils. These are soils that are located near rivers. The percentage of such soils on the ground is no more than 3%. The peculiarity of such soils is their constant flooding, which leads to the formation of a layer of mineral substances.