Nitrogen: added, lost and transformed in soil

Just a little doc with a couple of points (hopefully the main ones) about how nitrogen is added, lost and transformed in soil.

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  • Created by: Emily
  • Created on: 26-05-13 14:41
Preview of Nitrogen: added, lost and transformed in soil

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26/05/13
E. Singh
ROUND IN CIRCLES WITH NITROGEN
WHAT HAPPENS? HOW DOES IT HAPPEN?
Nitrogen added to soil Biological fixation by bacteria in root nodules
of legumes
NOx dissolved in rainwater
Nitrogen lost from soil Leaching - dissolving in rainwater and draining
away
Denitrification - bacteria convert NO3- to N2 and
NO2
Uptake by plants
Nitrogen transformed in soil Mineralisation - organic nitrogen to ammonium
nitrogen by soil micro organisms. Since NH4+ is a
positively charged ion (cation), it is attracted to
and held by the negatively charged soil clay
Nitrification - ammonium transforms rapidly to
nitrate (NO3-) in warm well-drained soil

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