Fertilizers explained

Question Which one of the following nutrients is not available in fertilizers? [CISF 2020]

A> Iron
B> Nitrogen
C> Phosphorus
D> Potassium

Answer: Iron

Explanation: This question can also be asked like what are the three major ingredients in Fertilizers? Fertilizers contain which elements or substances? Give some examples of fertilizers.
In simple language Fertilizers are used for plants to provide them minerals and ions needed for their healthy growth and functioning. Plants use nitrogen in the synthesis of proteins, nucleic acids, and hormones. They help in increasing the yield of crops. If you will see fertilizers bag, you will find NPK written on them. NPK stands for presence of Nitrogen, Phosphorus and Potassium compounds as ingredients of fertilizers.

Following are the some majorly used fertilizers with their Formulas and essential constituent  elements: 
FertiliserFormulaEssential element(s)
Ammonium nitrateNH4NO3Nitrogen
Ammonium sulfate(NH4)2SO4Nitrogen
Ammonium phosphate(NH4)3PO4Nitrogen, phosphorus
Potassium nitrateKNO3Potassium, nitrogen
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