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

1. Dichanthium annulatum and Azolla nilotica
2. Crotalaria juncea and Alhagi camelorum
3. Calotropis procera and Phyllanthus niruri
4. Saccharum munja and Lantana camara

Correct answer: Crotalaria juncea and Alhagi camelorum

Solution

Crotalaria juncea is a well-known green manure crop because it fixes nitrogen and adds biomass when incorporated into fields. Alhagi camelorum is adapted to sandy, arid soils and is used to improve such soils as green manure.

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