Fertiliser Technology
Which one of the following is used as a nitrogenous fertiliser, as a weed killer in the onion fields and for correcting acidic soils?

Urea
CAN
Calcium cyanamide
Ammonium sulphate

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Fertiliser Technology
Though kinetics of ammonia synthesis dictates the use of low temperature for high equilibrium conversion, yet it is kept moderately high (550°C), because at low temperature

Space velocity of gas is very low resulting in decreased conversion
Rate of reaction is very low
Very high pressure is required resulting in costly pressure vessel
None of these

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Fertiliser Technology
Phosphatic fertilisers

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

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