<p><sup>15</sup>N gas flux method allows for quantification of N<sub>2</sub> flux and tracing soil N transformations. An important requirement for this method is a homogeneous distribution of the <sup>15</sup>N tracer added to soil. This is usually achieved by soil homogenization and admixture of the <sup>15</sup>N tracer solution or multipoint injection of tracer solution to intact soil. Both methods may create artefacts. We aimed at comparing the results of the gas flux method using both tracer distribution approaches.</p> <p>Intact soil cores with injected <sup>15</sup>N tracer solution show wider range of the results obtained. Homogenized soil shows better agreement between repetitions, but significant differences in <sup>15</sup>N enrichment measured in soil nitrate and in emitted gases were also observed. For intact soil the wider variability of measured values rather results from natural diversity of non-homogenized soil cores than from inhomogeneous label distribution. Generally, comparison of the results of intact cores and homogenized soil did not reveal statistically significant differences in N<sub>2</sub> flux determination. In both cases, pronounced dominance of N<sub>2</sub> flux over N<sub>2</sub>O flux was noted. It can be concluded that both methods showed close agreement and homogenized soil is not necessarily characterized by more homogenous <sup>15</sup>N label distribution.</p>