Question

how does leguminous plants help in maintaining soil fertility​

Answer 1

Leguminous plants have root nodules that contain nitrogen fixing bacteria. A symbiotic relationship between the plant and rhizobium gives rise to these. These bacteria convert atmospheric nitrogen into forms that are usable by the plants such as ammonia. They restore the lost nitrogen content of the soil.

The root of leguminous plants contains nitrogen fixing bacteria such as Rhizobium,this bacteria use to convert atmospheric nitrogen into nitrate so that plant can absorb the nitrate and use them. hence leguminous plants help in replenishing the nitrogen in soil.