A laboratory experiment was carried out to determine the denitrification capacity of the Doganci, Gecitkale, Akdeniz, Balikesir, Pamuklu. Zumrutkoy and Turkmenkoy that are widely distributed soil series of Turkish Republic of Northern Cyprus. Soils are placed in anaerobic Jars (20% initial O-2, 80% He) with addition of 300 mg kg(-1) NO3-N. Produced gases (CO2, N-2 and N2O) along with O-2 consumption were determined by gas chromatography. Moreover, ammonium and nitrate concentration of the soils were measured at regular intervals. The measured 02 consumption and CO2 production values as parameters of biological activities revealed considerable differences among the soil series studied. The more rapid O-2 Consumption and the higher CO2 production were determined in Balikesir, Zumrijtkoy and Tarkmenkoy soil series. Furthermore, O-2 level in the anaerobic jar was immediately dropped in early measurement intervals and was about 0% at the end of the last. measurement, particularly above mentioned soil series. The Zumrutkoy soil series has higher CO2 production in,all measurement periods than the others and reached 975 mu g CO2 g dry soil(-1) at the end of experiment where others vary, from 257 to 745. The measurements of N2O and N-2 gases revealed that the. most of the denitrification product consists of N-2. Additionally, the highest N2O and N-2 productions were determined in.the Balikesir series with 251 mu g N2O-N g dry soil(-1) and 498 mu g N-2-N g. dry soil(-1). When all series compared, there were significant differences for the production of N-2 and N2O production. Nitrate and ammonium analyses measured in relation to time, ammonium content was similar in all series, however, nitrate content significantly decreased according to the measurement period.