When inorganic fertilizer and organic manure applied to the soil nitrates ions are given out which are either retuned  or removed  from the atmosphere .

There are many ways in which nitrogen is retuned to atmosphere

Denitrification

volitalisation

Also there are ways in which nitrogen is removed from the atmosphere;

• Lighting
• The nitrogen fixation by bacteria:
  • The symbiotic
  • The  non symbiotic nitr0gen fixation

What is the form in which nitrogen is absorbed  by the crops?

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