Which one of the following is used as a nitrogenous fertiliser, as a weed killer in the onion fields and for correcting acidic soils ?
Correct answer: B. Calcium cyanamide
- A. Urea
- B. Calcium cyanamide
- C. Ammonium sulphate
- D. CAN
Explanation
Calcium cyanamide supplies nitrogen, acts as a weed suppressant in crops such as onions, and its alkaline action helps correct acidic soils. These combined uses identify it as the intended fertiliser.
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