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

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

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Fertiliser Technology
Phosphatic fertilisers

Lessen the effect of excessive nitrogen application
None of these
Accelerate fruit formation in later stages of growth
Are useful during early stage of the plant growth

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