[14C] beta-NOA was degraded in the four tested soils under aerobic conditions. According to the notifier, the most of degradation products were not extractable from the soils (bound residues), and accounted for 68.99 % and 62.72 % at day 94 in soils 1 and 2 respectively, and accounted for 69.44 % and 72.62 % at day 62 in soils 3 and 4, respectively. The mineralisation increases during the study and reaches 7.06 % of applied radioactivity for soil 1 and 2 (mean value) and 12.05 % of applied radioactivity of soil 3 and 4 (mean value). A very low part of the applied radioactivity is found in the volatile organics compartment (max. of 1.20 % of AR for soil 1 at day 81). beta-NOA seems to be degraded in four other compounds but these were not characterised and the analysis of the extractable radioactivity in the soils was performed only on three dates.