How do most plants take up nitrogen?

Plants take up nitrogen compounds through their roots. Animals obtain these compounds when they eat the plants. When plants and animals die or when animals excrete wastes, the nitrogen compounds in the organic matter re-enter the soil where they are broken down by microorganisms, known as decomposers. It is the whole circle of nature.

Hello. Let me explaine.

Explanation:

Most plants usually use four ways to absorb nitrogen from soil:The atmospheric nitrogen enters empty spaces between soil grains. There are special bacterias that transform atmospheric nitrogen into amoniom ion. Then، amoniom ion is absorbed by plant. The second way starts after transforming atmospheric nitrogen to amoniom ion. The amoniom ion is transformed to nitrate ion by another special bacteria. Then the nitrate is absorbed by the plant. Another way starts from the homous. Homous is transformed to amonia (NH3) by an another special bacteria then the amonia reactions with H+ in soil and makes amoniom. Then amoniom ion is absorbed by the plant. The fourth way after production of amoniom from homous، it is transformed to NO3- then it will be absorbed by the plant.