Seven degradation compounds were found. The major degraded compound S1 increased from 1.68% AR at 0 day to 40.41% AR at 35 days, then it decreased to 22.21% AR at 63 days. The compound S2 increased from 3.22% AR at 7 days to 5.74% AR at 45 days, then it decreased to 4.80% AR at 63 days. The compound S4 increased from 0.99% AR at 7 days to 3.07% AR at 28 days, then it kept constant till 63 days. The compound S9 was present at about 1% only at 13 and 17 days. Other three minor compounds (S5, S6 and S7) were found, and their amount never reached values as high as 5% AR. The amount of unextracted radioactivity (bound residue) increased from 3.72% AR at 7 days to 41.28% AR at 63 days. The fractionation of organic matter of the bound residue at 45 and 63 days showed that the most radioactivity was in fulvic acid fractions (12.04% AR and 17.64% AR respectively) while minor amounts were in humic acid fractions (6.15% AR and 8.57% AR respectively) and humin fractions (5.15% AR and 7.27% AR respectively) Volatile radioactivity, as evolved 14C-CO2, increased from 0.38% AR at 17 days to 2.06% AR at 63 days. At 7 days and 13 days its amount was lower than detection limit. [Scacchi A., Pizzingrilli G., (2001b)]