Soil fertility can be destroyed by

a. cutting down forest
b. acid rain
c. overgrazing and over-irrigation

Soil fertility is the ability of level of soil to grow and support plant life. Fertile soil contains the sufficient minerals and nutrients needed for plant growth. It is often composed of large amounts of topsoil. An important characteristic of soil fertility is its sufficient amount of microorganisms such as bacteria, fungi, earthworms, protozoa and nematodes. Soil fertility can be destroyed by cutting down forests, acid rain and over grazing and over irrigation.