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

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Fertiliser Technology
Potassic fertilisers

Help in development of starches of potatoes and grain
Stimulate early growth and accelerate seeding
Are useful during early stage of the plant growth
None of these

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