Discussion
Consider the following statements about caking of fertiliser in storage.
1. Moisture pickup followed by drying is the principal cause.
2. Coating agents and moisture-proof bags are used to prevent it.
3. Urea is entirely free of the problem.
Answer: D
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: caking arises when a hygroscopic material picks up moisture and then dries, so that dissolved salt recrystallises and bridges the particles into a solid mass, and the remedies are anti-caking coatings and moisture-proof packaging. Statement 3 is wrong - urea is markedly hygroscopic, with a critical relative humidity around 75 per cent, and cakes readily.
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