When you study biology, what you will learn about the carbon element is that it brings life.
So if you want to introduce life to soil, you have to cover it with organic matter with a lot of carbon.
This organic matter can be wood, straw, leaves, hay, or compost.
If your garden beds are covered at all times with carbon you will introduce a lot of nutrients for your plants.
The life in the soil eats the carbon cover and provides nutrients for the plants.
How do you mulch your garden beds?