Question

Which of the following nutrients is not available in fertilizers?
(A) Nitrogen
(B) Phosphorous
(C) Iron
(D) Potassium

Answer 1

Hint: Fertilizers are compounds of natural or synthetic origin which act as the food of the plants and are added to the crops to increase the production of the crops. These do the same work to the plants that added vitamins or mineral supplements do to our body.

Complete answer:
The fertilizers are added to the plants and the crops to enhance their growth. There are three main nutrients that enrich the soil and they are called the “NPK”, where N stands for nitrogen, P stands for Phosphorous, and K stands for Potassium. These are the major or the primary nutrients or the macro nutrients as Nitrogen is required for the growth of the plant, Phosphorous is required for the development of roots, flower, seeds, and fruits, and potassium is required for stem growth, movement of water in plants, promotion of flowering and fruiting.
The other nutrients or the secondary nutrients that are required by the plants include calcium, magnesium and sulphur and the micronutrients include copper, iron, manganese, molybdenum, magnesium, zinc, and boron, of very little significance is silicon, cobalt, and vanadium.
Among these nutrients those that are supplied by the fertilizers are Nitrogen, Phosphorous, and Potassium. Iron is not present in the fertilizers.
Hence, the correct answer is option (C).

Note:
The fertilizers include different categories and include single nutrient fertilizers such as calcium ammonium nitrate, phosphogypsum, triple superphosphate, etc. and multi-nutrient such as the “NPK” fertilizers, binary fertilizers including diammonium phosphate and monoammonium phosphate.