A) Nitrogen
B) Potash
C) Phosphorus
D) All of these
Correct Answer: A
Solution :
Urea fertilizer contains 46% Nitrogen (N) element, which is an essential to plants/crops. Nitrogen is a major/primary/manurial element that helps in providing dark green colour in plants, increase in growth of leaves, stem, protien in grains, etc. Plants absorb nitrogen mostly in nitrate \[N{{O}_{3}}\] and Ammonium nitrate \[N{{H}_{4}}^{+}\] ions.
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