How does soil health affect plant growth?

How does soil health affect plant growth? The microbes in soil and on plant roots provide essential nutrients, vitamins and plant growth regulators to plants, and prevent pathogen invasions by both stimulating plant defences and being antagonistic to invading pathogens.

The microbes in soil and on plant roots provide essential nutrients, vitamins and plant growth regulators to plants, and prevent pathogen invasions by both stimulating plant defences and being antagonistic to invading pathogens.