The Nitrogen Cycle. All life requires nitrogen-compounds, e.g., proteins and nucleic acids. Air, which is 79% nitrogen gas (N2), is the major reservoir of nitrogen. But most organisms cannot use nitrogen in this form.Click to see full answer. Keeping this in consideration, what is the main reservoir for nitrogen? atmosphere Likewise, where is the largest reservoir of nitrogen in the nitrogen cycle? By far the largest reservoir of total nitrogen on Earth is the dinitrogen gas (N2) in the atmosphere (Table 4.1). N2 is also the major form of nitrogen in the ocean. Correspondingly, where is the main reservoir of nitrogen? So the largest nitrogen reservoir on earth is atmosphere. The major component of air is Nitrogen which is about 79% of all the constituents. Hence, is the largest reservoir of Nitrogen.What are two reservoirs for nitrogen?Nitrogen moves slowly through the cycle and is stored in reservoirs such as the atmosphere, living organisms, soils, and oceans along its way. Most of the nitrogen on Earth is in the atmosphere. Approximately 80% of the molecules in Earth’s atmosphere are made of two nitrogen atoms bonded together (N2).

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