Question

how is nitrogen fixed in the soil by leguminous plants ?​

Answer 1

Answer:

To do so, they need help from Rhizobium bacteria. These special bacteria stimulate the growth of nodules on the roots of leguminous plants. The bacteria help the plant by extracting nitrogen from the air, while the plant helps the bacteria grow by supplying carbon. It is a perfect symbiosis.

Nitrogen is fixed, or combined, in nature as nitric oxide by lightning and ultraviolet rays, but more significant amounts of nitrogen are fixed as ammonia, nitrites, and nitrates by soil microorganisms. ... Within the nodules, the bacteria convert free nitrogen to ammonia, which the host plant utilizes for its development.