Question

Why plant need nitrogen it is compulsory

Answer 1

Nitrogen Requirements for Plants. As organic matter decomposes, nitrogen is slowly converted to ammonium, which is absorbed by plant roots. Excess ammonium is turned into nitrate, which plants also use to produce protein. However, unused nitrates remain in the groundwater, resulting in leaching of the soil.

Answer 2

Because if the soil is said to be fertile means it also says that it has enough nitrogen which plays a main role in growing the plant