Assertion (A): Cotton crops exhaust the fertility of soils rapidly. Reason (R): Regular application of manures and fertilisers to the soils is necessary.

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Both A and R are true and R is the correct explanation of A. Explanation: Both statements are true and R correctly explains A, cotton is a nutrient‑demanding crop that rapidly depletes soil fertility, so regular application of manures and fertilizers is needed to restore nutrients and maintain yields.

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