Nitrogen is found as N2 in the atmosphere and is the main component of air, accounting for about 78% of its composition. The nitrogen cycle begins with the transformation of N2 from the atmosphere into other nitrogen compounds. For this reason, we can conclude that the nitrogen cycle has a large atmospheric component.
The biogeochemical cycle of phosphorus is simpler compared to other elements such as carbon and nitrogen. In the phosphorus cycle there is no passage of this element through the atmosphere. Phosphorus is the only macronutrient that does not exist in the atmosphere. It is found only in its solid form in the rocks. For this reason, we can conclude that the phosphorus cycle has a large sedimentary rock component.
