When is a soil healthy?
If organic material and organic matter remain at the same level. It cannot be measured in number, because there are many different types of soil, but a soil must receive organic material, organic matter and trace elements in order for soil life to persist.
The crops and plants that grow on a soil need nutrients from the soil in order to grow. To prevent one-way traffic it is important to supply the soil of organic matter and nutrients regularly with organic fertilizers. There are different types of soil nutrition.