Which of the following macronutrients is used in fertilizers?

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Answer:

Nitrogen, Potassium and Phosphorus are important constituent of fertilizers.
They are required in abundance by the plants.
Oxygen is not used in artificial fertilizers.
They in fact interfere with the process of nitrogen fixation carried out by cyanobacteria.

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Now a days “Organic Farming” is a buzzword. The advantages of the organic farming are:

1.It is cost effective

2.It consumers less time

3.Requires less labour

Which among the above are correct?