Is it nitrogen or nitrate that plants require to make proteins?

Question

is it nitrogen that the plants require to make proteins or the nitrate that is formed using bacteria in the soil and nitrogen?

If it is nitrogen, then why does the Haber Process go through the trouble of making it into ammonia?

Answer 1

Plants get the nitrogen they need from the soils or water in which they live mostly in the form of inorganic nitrate (NO3-).Plants use nitrogen by absorbing either nitrate or ammonium through the roots.
A legume plant’s ability to use nitrogen from the air is the best known benefit of growing legumes but the least understood. Approximately 79% of the air is nitrogen gas. However, it is not in a form that plants can use. In reality it is not the plant that removes nitrogen from the air but Rhizobium bacteria which live in small tumor like structures called nodules on the legume plant roots. These bacteria can take nitrogen gas from the air in the soil and transform it into ammonia (NH3) that converts to ammonium (NH4) which can be used by the plant.

Answer 2

Nitrate ions..which r taken by the roots..they are found in the soil..and during lightning, nitrogen in the air,is turned into nitrates..there's also nitrogen-fixing bacteria..its all about ecology..

Answer 3

Both are important. Plant need the N and the O (in nitrates) for their proteins making assembling needs

Answer 4

I feed my plants nitrogen. Does that help?

Answer 5

nitrate