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Nitrogenisanessentialelementforplantgrowth.Kjeldahlmethodhasbeenusedtodeterminetotalnitrogeninsoilsforalongtime.Asidefromorganicnitrogen,itiswellknownthatfixedammoniumispresentinallsoilsoftheworldandaccountsforfroml%to72%ofthetotalsoilN(YoungandAldag,1982
Nitrogenisanessentilementforplantgrowth.Kjeldahlmethodhasbeenusedtodeterminetotalnitrogeninsoilsforalongtime.Asidefromorganicnitrogen, itiswellknownthatfixedammoniumispresentinallsoilsoftheworldandaccountsforfroml% tothetotalsoilN (Young and Aldag, 1982