How do plants get nitrogen

Plants obtain nitrogen through the Nitrogen cycle. Air consists of 78 percent nitrogen, which is in the form of nitrous oxides ... Rain water dissolves these oxides and nitrogen enters the soil, which plants then absorb by drawing in water through the roots ...

They take nitrogen from the soil by absorption through their roots as a amino acids, nitrate ions, nitrite ions, Or ammonium ions. It does not come directly from the air.