A crop plant which can grow in nitrogen deficient soils without external supply of it is

Solution (By Examveda Team)

A crop plant that can grow in nitrogen-deficient soils without an external supply of it is Cajanus cajan.
The Cajanus cajan is a perennial legume from the family Fabaceae native to the Old World. The pigeon pea is widely cultivated in tropical and semitropical regions.
Cajanus is a highly leguminous crop and can fulfill the need for nitrogen even in nitrogen-deficient soil by fixing atmospheric nitrogen itself.