. . . . . . . . nitrogen present is the soil air.

The soil air contains several gases of which nitrogen, oxygen, carbon dioxide and water vapor are the most important. Soil air is present in the pores or cavities present in between the loosely bound soil particles. Soil sir constantly moves from the soil pores into the atmosphere and from the atmosphere into the pore spaces.
79.2% of nitrogen is present in the soil air, it percentage is more than the atmospheric air.