Question

what is the role of legumes in a crop rotation program 1)to prevent soil eroisen 2) to increase soil fertility 3)to prevent disease of crop rotation 3)to prevents water loss from the soil only one is answer​

Answer 1

to increase soil fertility

Answer 2

the answer is 2.

i.e. to increase soil fertility

But why?

well they have bacterias present in their roots.

Rhizobium, which convert atmospheric nitrogen into organic nitrogen which increases fertility.