1. Nitrogen is a major nutrient for plant growth.
2. Proper carbon/nitrogen ratio in soil is necessary for plant growth.
3. It is component of proteins in the form of amino acids.
4. Proteins are synthesised from photosynthetic products sugars.
5. Nitrogen exists in atmosphere but it is inert, non-reactive.
6. Plants need nitrogen in a reactive form usually nitrate in soil.
7. This supply need to be maintained through biological and physical nitrogen fixation.
8. Otherwise productivity is affected hence it is limiting nutrient in the agricultural ecosystem.
