Performance evaluation of lysimeter experiments for simulating pesticide dissipation in paddy fields. Part 1: Submerged application of granular pesticides

Journal of Pesticide Science
Kei KondoKazutoshi Ohyama

Abstract

Three-year comprehensive experiments were conducted to compare the dissipation patterns of a total of 16 pesticides, including 3 metabolites, as granular formulations applied in lysimeters and paddy fields with two soil types. Analytical concentrations of the target pesticides in paddy water were analyzed using a granular kinetic model consisting of the following parameters: release rate, decrease rate, and dissolved concentration. Results of parameter grouping analyses of the kinetic models showed that 56% of data reproducibility (entire grouping) was obtained between replicates for the lysimeters. In comparisons between the lysimeters and paddy fields, 48% of decrease rates and 34% of release rates were grouped, although significant differences were observed with a nearly 90% difference for dissolved concentrations. These differences might be attributed to the hydrological components such as water management and meteorological covariates in paddy fields, the daily percolation in lysimeters and the adsorption-desorption kinetics between paddy water and soil.

References

Jan 5, 2002·Water Research·Miki SudoTakuya Okubo
Nov 2, 2005·Pest Management Science·Hirozumi WatanabeSon Hong Vu
Dec 13, 2006·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Tsuyoshi KawakamiTeruo Higashi
Oct 9, 2009·Chemosphere·Dang Thi Tuyet NhungDang Quoc Thuyet
Feb 3, 2012·Bulletin of Environmental Contamination and Toxicology·Masayuki MorohashiKuniaki Kawata
Nov 20, 2016·Journal of Pesticide Science·Toshiyuki Katagi

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