A) Azolla
B) Azadiracta indica
C) Crotolarea juncea
D) Hevea brassiliansis
Correct Answer: C
Solution :
Crotolaria juncea, common name sunn hemp. A quick growing crop, is cultivated and ploughed under to incorporate it into the soil. A green manure crop supplies organic matter and additional nitrogen and also exercises a protective action against erosion and leaching.
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