Which of the following practices can help in water conservation in agriculture? 1. Reduced or zero tillage of the land 2. Applying gypsum before irrigating the field 3. Allowing crop residue to remain in the field Select the correct answer using the code given below:
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A hard Environment multiple-choice question from UPSC Prelims 2017. Attempt it above, then check the correct answer and detailed explanation below.
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Correct answer: C. 1 and 3 only
Reduced/zero tillage (1) and leaving crop residue in the field (3) conserve soil moisture. Applying gypsum before irrigation (2) is a soil-amendment practice for saline/sodic soils, not a water-conservation measure. So 1 and 3 only — option (c).
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