Which of the following plants are used as green manure in crop fields and in sandy soils

Options

A. Dichanthium annulatum and Azolla pinnata
B. Crotalaria juncea and Alhagi camelorum
C. Calotropis procera and Phyllanthus niruri
D. Saccharum munja and Lantana camara

Answer

B

Explanation

In green manure quick growing crops cultivated an ploughed into the soil which increase crop yield by 30 - 50% e.g. Sesbania aculeata, Crotalaria juncea, vigna sinensis etc.