Question

there is no need to put nitrogenous fertilizers in the
feild with leguminous plant.

Answer 1

Answer:

Leguminous plants have symbiotic nitrogen fixing bacteria in their roots.

Explanation:

There is no need to put nitrogenous fertilisers in the field with leguminous plants because leguminous plants have symbiotic bacteria living in the roots of these plants which fix atmospheric nitrogen in the soil.

The bacteria which fix nitrogen are rhizobium and azolla.