Pesticide paddy field model (PADDY) for predicting pesticide concentrations in water and soil in paddy fields

✍ Scribed by Inao, Keiya; Kitamura, Yasuo

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 234 KB
• Volume: 55
• Category: Article
• ISSN: 1526-498X
• DOI: 10.1002/(sici)1096-9063(199901)55:1<38::aid-ps851>3.0.co;2-p

✦ Synopsis

To evaluate the fate of pesticides in paddy üelds, the pesticide paddy üeld model (PADDY) has been developed for predicting pesticide concentrations in paddy üelds and the run-oþ amount of pesticides to the aquatic environment. This model focused particularly on granule formulation because these formulations have been used widely as herbicides on paddy üelds in Japan. The behavior of pesticides in paddy üelds was assessed by considering the main processes on the basis of a compartment system and the mass-balance equations of pesticides in the compartments were derived from kinetic data. The mathematical model, PADDY, was constructed by numerical solution techniques. A method for measuring the pesticide parameters for this model was also developed. To validate the model, a üeld experiment was carried out on a paddy üeld and the concentration changes of pesticides in water and soil were measured. These were in reasonably good agreement with those predicted by PADDY.