Fertiliser Technology
Urea is a better fertilizer than ammonium sulphate, because

It is easy to manufacture
It is cheaper
It is not poisonous
Nitrogen content is higher

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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
To lessen the effect of excessive potash application
For accelerating fruit formation in later stage of growth

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