Why do plant need nitrogen? How do plants obtain nitrogen?

1.	Why do plant need nitrogen? How do plants obtain nitrogen?
Answer» Nitrogen is an important element for all living organisms. Plants obtain nitrogen through a natural process. Nitrogen is introduced to the soil by fertilizers or animal and plant residues. Bacteria in the soil convert the nitrogen to ammonium and nitrate, which is taken up by the plants by a process of nitrogen fixation.All plants need nitrogen to make amino acids, proteins and DNA, but the nitrogen in the atmosphere is not in a form that they can use.

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