Why are leguminous crops such as cowpea, groundnut, and soybean typically included in a crop rotation schedule?
Answer and explanation
Correct answer: B. Their root nodules house symbiotic Rhizobium bacteria that fix atmospheric nitrogen to enrich soil fertility
- Step 1: Legume roots form symbiotic nodules with nitrogen-fixing bacteria. Step 2. These bacteria convert atmospheric nitrogen into soil nitrates, replenishing soil nutrients naturally without chemical fertilizers. Answer: Their root nodules house symbiotic Rhizobium bacteria that fix atmospheric nitrogen to enrich soil fertility. Why not the others: Legumes do not absorb toxic salts; they require normal management; they do not secrete universal chemical herbicides.
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