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
Comparatively higher pressure drop
Higher pumping cost
Chances of entrainment and disturbance of catalyst bed

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Fertiliser Technology
Nitrogenous fertiliser is required

During the early stage of growth to promote development of stem and leaves
None of these
For accelerating fruit formation in later stage of growth
To lessen the effect of excessive potash application

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