Question

N2 is an essential nutrient for plant growth but farmers who cultivate pulse crops like green gram , bengal gram do not apply nitrogenous fertilisers during cultivation why?

Answer 1

→ Yes the farmers that grow the Bengal gram and other such types of the plants of same species don't need the nitrogen due to the a bacteria is the Rhizobium which will be present on the root nodules of these species of the plants.
→ This bacteria actually converts the atmospheric nitrogen and supply  it to the plant.
→ In return the plant gives the plant shelter to stay and the nutrients it need.
→The kind of relationship is know as the symbiotic relationship where both the host organism and the guest organism will be benefited.