A study to compare the degradation rates of atrazine (6-chloro-N 2-ethyl-N 4-isopropyl-1,3,5-triazine-2,4-diammine) and isoproturon [3-(4-isopropylphenyl)-1,1-dimethylurea] in soils from sugarcane fields with different practices of herbicides application was carried out. 14C-atrazine was poorly mineralized to 14CO2 (1.10% ± 0.22%) after 139 days of incubation in soil without previous exposure to atrazine. In the same soil also with no previous isoproturon exposure isoproturon was mineralized to 14CO2 by 7.70% ± 0.94%. Atrazine mineralization after 98 days was 13.4% ± 0.30% in soil which discontinued the use of atrazine in 1997 while it was 89.9% ± 1.23% in soil in which atrazine is currently being used. The isoproturon mineralization values were 7.24% ± 0.85% and 22.97% ± 0.96% in soil which discontinued atrazine and soil currently using atrazine, respectively.
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We thank the Alexander Von Humboldt foundation for the purchase of uniformly 14C-ring labeled atrazine and the fellowship granted to Z. M. Getenga to carry out the study. We also thank the German Research Center for Environmental Health (Helmholtz Zentrum München) for providing the facilities, consumables and purchase of 14C- ring labeled isoproturon.
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Getenga, Z.M., Dörfler, U. & Schroll, R. Laboratory Degradation Studies of 14C-Atrazine and -Isoproturon in Soil from Sugarcane Cultivated Fields Under Kenyan Tropical Conditions. Bull Environ Contam Toxicol 82, 678 (2009). https://doi.org/10.1007/s00128-009-9672-1