The diagram illustrate details of coastal city groundwater with present nitrogen sources and concentration level.
In coastal vegetation, due to the rainfall two reaction happens which constitute as nitrogen source in the soil that are nitrogen oxidisation by lighting which causes ammonia degassing. Another reaction is nitrogen fixation by vegetation which causes denitrification in the soil.
In domestic and market gardens, nitrate act as a nitrogen source which is taken by the soil particles due to excess use of fertilizers and discharge of household liquid wastes in soil.
Industrial waste which are discharge in storage tanks and in ponds help in increasing the concentration level of nitrogen in the soil. Similarly, waste disposal in landfill also help in increasing the concentration of nitorgen in the soil.
The concentration of nitrogen in groundwater is directly proportional to colour density and overall, flow of groundwater is in the direction of oceans and this flow takes all these nitrogen sources and excess of nitrogen away from the soil and discharge it on the ocean from were this cycle was started. 
The diagram illustrate  
details
 of coastal city groundwater with present nitrogen  
sources
 and  
concentration
 level.
In coastal vegetation, due to the rainfall two reaction happens which constitute as nitrogen  
source
 in the  
soil
 that are nitrogen  
oxidisation
 by lighting which causes ammonia degassing. Another reaction is nitrogen fixation by vegetation which causes denitrification in the soil.
In domestic and market gardens, nitrate act as a nitrogen  
source
 which  
is taken
 by the  
soil
 particles due to excess  
use
 of fertilizers and discharge of household liquid wastes in soil.
Industrial waste which are discharge in storage tanks and in ponds  
help
 in increasing the  
concentration
 level of nitrogen in the  
soil
.  
Similarly
, waste disposal in landfill  
also
  help
 in increasing the  
concentration
 of  
nitorgen
 in the soil.
The  
concentration
 of nitrogen in groundwater is  
directly
 proportional to  
colour
 density and  
overall
, flow of groundwater is in the direction of oceans and this flow takes all these nitrogen  
sources
 and excess of nitrogen away from the  
soil
 and discharge it on the ocean from were this cycle was  
started
.