Nitrification:- this has referred to the conversion of -NH4 to NO3 via NO2.
                 - the boiling point if it's are highest corresponding to any organic                                                  compound.
                 -it is colourless, neutral and sparingly soluble in water.

denitrification:-  NO3 ==> N2 (g). This is a reductive mechanism. It is only one                                                mechanism during which nitrate is reduced.
                    - require the presence of organic matter (carbon source) to act as                                               an  electron donor 

the product form by nitrification are have high boiling point if it is liquid
nd via means nh4 to no2 then no3..
3 rd point of denitrification?
i explain what i know. so..
Thanks a lot..... stil a great answer