Movement of Pesticides in watercourse. 2. Fate of herbicides and diazinon in water following submerged application in paddy fields

Abstract

The appearance of pesticide residues in paddy, irrigation, and creek water was monitored in Saga Agricultural Experiment Station, in 1981 for chlormethoxynil, CNP (chlornitrofen), oxadiazon and pyrazolate, and in 1983 for CNP, simetryn, oxadiazon and diazinon. When the precipitation was low, 20% of diazinon, 3% of simetryn and 0.05% of benthiocarb, CNP, and chlormethoxynil applied on paddy fields were estimated to reach the water. When the precipitation exceeded 70mm, 3% of oxadiazon and pyrazolate applied on paddy fields was recovered in the water.