Monitoring isoproturon leaching in the field by drainage and porous cup sampling

Isoproturon transfer was studied in the field by monitoring soil water sampled by porous cups or by drainage. The monitoring campaign showed early high concentrations of isoproturon in drainage water but lower levels in water from porous cups. Such differences revealed two types of water movement in soil: (l) slow movement to porous cups which allows interaction between herbicide and soil components, (2) fast flow down to drain without this possibility. The two sampling methods tended to be complementary in studying pesticide potential to reach surface and ground water.