Question

write the role of leguminious plant in increasing the nitrogen content of the soil

Answer 1

They take help of Rhizobium as they pro ice Rhizobium shelter.

Answer 2

leguminous plants are those plants which produces pulses and in there roots are present nitrogen fixing bacteria or rhizobium bacteria
which fixes free nitrogen of atmosphere and convert it to nitrogenous compounds which are helpful in the growth of plant and thus ultimately making the soil fertile
Hope it helps you