A) Urea
B) Ammonium Phosphate
C) Nitrous oxide
D) Calcium Chloride
Correct Answer: A
Solution :
Urea\[{{(CON{{H}_{2}})}_{2}}\] is only a nitrogenous fertilizer, containing 46% N, having mobile nature say; this can be used at 3 times in crop e.g., basal/before seed sowing; after sowing and at foliar spray. While other three e.g.. Ammonium Phosphate (18-46 N, P), Nitrous Oxide and Calcium Chloride contains two elements each.
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