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why do plants need nitrogen?how do they obtain it?

Plants need nitrogen to make proteins. As the plants cant take atmospheric nitrogen directly from air so they mainly obtain it with the help of bacterias present in the soil.

For example Rhizobium bacteria which lives on the roots of leguminous plants.It converts atmospheric nitrogen into nitrates which can be used by plants.

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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. Other plants get the nitrogen they need from the soils or water in which they live mostly in the form of inorganic nitrate (NO3-). Bacteria living in plant nodules in the soil on the roots of the plant also provide the plant with the nitrogen it needs while providing the bacteria a sugar source. Nitrogen is a limiting factor for plant growth.

they absorb it in dissolved form from the water in the soil as NH4+ or as NO3-




 
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All plants need nitrogen to make amino acids, proteins and DNA, as well as to make chlorophyll. Only legume plants can obtain nitrogen from the air; most plants have to obtain nitrogen and all other nutrients from the soil.
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