Nitrogen Fixation Bacteria

When we're aerating the soils, we're putting a bunch of nitrogen around the roots. Nitrogen fixation occurs in two different ways. It can occur free living bacteria. In other words, they're out there in the soil. They're fixing nitrogen for themselves. When they are consumed, that nitrogen becomes available to either the organism that's consuming it or to a plant which is in the vicinity. That nitrogen is obviously usable nitrogen because it's been fixed into a form and could be utilized by these plants that require it.