Which one of the following green manuring is preferred to the crop grown in alkali soils?

Correct option is B

✅ (b) Dhaincha (Sesbania aculeata): • Dhaincha is a salt-tolerant legume, ideal for alkali/sodic soils. • Fixes nitrogen and adds organic matter to improve soil structure and fertility. • Recommended before transplanting rice in alkali soil reclamation programs.
❌ (a) Sanai: • Good green manure, but less tolerant to alkalinity compared to Dhaincha.
❌ (c) Guar: • Used in rainfed regions; not highly salt-tolerant.
❌ (d) Cow pea: • Used in normal soils, not as effective in alkali soils.