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DINITROGEN (N2) N20 <br /> Nitrous Oxides NO <br /> NO2 <br /> Ammonia NH3 <br /> Nitrate <br /> (NO3-) Organic Nitrogen <br /> Nitrite Ammonium <br /> (NO2-) (NH4+) <br /> FORMS OF NITROGEN -Approximate Sizes Correspond to Relative Abundance <br /> Organic Nitrogen LIQUID PHASE SOLID PHASE <br /> Microbial Cells weak) adsorbed, mobile <br /> (weakly ) (strongly adsorbed, immobile) <br /> LFAnimals A <br /> B <br /> Plants <br /> Organic Nitrogen <br /> NH4+ <br /> C Ammonium <br /> - NH4+ <br /> A - Ammoni(ication E - Immobilization <br /> B - Mineralization F - Denitrification <br /> C - Nitrification G - Dinitrogen Fixation, <br /> D - Nitrate Reduction non-symbiotic Nitrate <br /> H - Dinitrogen Fixation, _ <br /> Symbiotic N�3 <br /> NITROGEN TRANSFORMATIONS <br /> redrawn from Alexander, 1979 <br /> NITROGEN CYCLE <br /> Fate and Transport of Nitrogen in Domestic Wastewater <br /> United Methodist Church <br /> ift DAMES& MOORE Lodi, California <br /> 27195.002.044 SJR 5205b 9/27/94 FIGURE 1 <br />