According to research, it is stated that the plants don’t get nitrogen directly from the air. It is quite contradictory as nitrogen is considered to be the most abundant part/element in air.
In general, plants take nitrogen from the soil by the process of absorption. They absorb various types of ions like amino ions, nitrite ions, nitrate ions and also ammonium ions from the soil, with roots as the pathway.
However, the ions that they procure from soil, is not readily used by them. These ions are carried to the leaves and are processed there. The leaves fix it up to the required element. And finally, they produce this fixed up element on their stems.
Overall, the nitrogen procured by plants is not readily taken from air.
I hope this answer helps!😊