Fertiliser Technology
Reaction of calcium fluorapatite with sulphuric acid produces

Triple superphosphate
Red phosphorous
Ortho-phosphoric acid
Simple superphosphate

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Fertiliser Technology
Nitrogenous fertiliser is required

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

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