This research was carried out in Engenheiro Coelho-SP, Brazil, to study the persistence of sulfentrazone in soybean ecosystems and the effects of the toxicity of its residues on millet, sunflower, oats, wheat and beans cultivated in succession to soybean. The soybean field soils had, respectively, 46% of clay; 12% of silt; 42% of sand 4% of OM and pHs of 5.8. The experiment was designed in randomized blocks with 5 replications. Soil samples were collected at the depth of 0-10cm, from 0-539 DAT (24 timings). Sulfentrazone persistence was evaluated by bioassay using sugar beet as test plant. In soybean field, sulfentrazone effects on sugar beet were detected up to 376 and 539 DAT for 0.6 and 1.2 kg a.i. ha-1, respectively. Based on the analysis of the crops in succession to soybeans, sulfentrazone residues affected the growth and yield of millet and oats; sunflower and beans were not affected and wheat was affected only by the highest rate.
bioassays; sulfentrazone; persistence; succession cultures
