Fertiliser Technology
Multistage operation (as in the case of catalytic oxidation of SO₂) is not carried out for NH₃ synthesis, because of

Comparatively higher pressure drop
Higher pumping cost
Chances of entrainment and disturbance of catalyst bed
High cost of the high pressure vessel used for the reactor

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Fertiliser Technology
Plant tranquillisers

Accelerate ripening of food and grain
Hold back stem growth and halt plants at a desired height
Cause early maturation of plants
Produce seedless fruit

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