Question

nitrogen is an essential nutrients for plant growth but farmers who cultivate pulses crops like green gram Bengal gram black gram do not apply nitrogenous fertilizers during cultivation why​

Answer 1

Answer:

Explanation:

crops like green gram and other grams are called leguminous crops. They facilitate the growth of some bacteria like rizhobium. These bacteria help in nitrogen fixation(convert atmosphere nitrogen into absorbable form in the soil). Hence the soil where gram is grown is rich in nitrogen thus doenst need fertilizers.

In return for this the plants provides food to the rizhobium. This is symbiosis.