Fertiliser Technology
Liquid ammonia is not used as such a fertiliser in tropical countries like India, because

It is not available
Its N₂ content is very low
It will evaporate on spraying
It is very costly

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Fertiliser Technology
Excessive use of chemical fertilisers causes shrivelling of the roots and wilting of the plant, because the

Osmotic pressure of the soil water becomes less than that of the plant sap
Soil becomes too acidic
Soil becomes too alkaline
Osmotic pressure of the soil water becomes higher than that of the plant sap

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