
TY  - JOUR
A1  - Ismail, B. S. 
A1  - Kailasam, Kalithasan 
T1  - Measurement and prediction of permethrin persistence in six Malaysian agricultural soils
JF  - Soil Research
JO  - Soil Res.
Y1  - 2002
VL  - 40
IS  - 5
SP  - 817
EP  - 826
KW  - half-life, pyrethroid, dissipation.
UR  - https://doi.org/10.1071/SR01097 
N2  - The effect of soil types, soil temperature, and soil moisture content on the degradation of permethrin was studied under controlled greenhouse conditions. Six soils were used in the study: Soil 1 (Teringkap series), Soil 2 (Ringlet series), Soil 3 (Teringkap 2), Soil 4 (Teringkap 3), Soil 5 (Gunung Berinchang), and Soil 6 (Lating series). Observed data showed that permethrin was more persistent in Soil 1 (23.3 days) and less persistent in Soil 5 (16.7 days). Similarly, the degradation rate coefficient (k) was greater in Soil 5 than Soil 1. The half-life and the dissipation patterns of permethrin between the observed and predicted data were not much different in all 6 soils studied, even though the predicted data were slightly higher. The half-life of permethrin in Soil 6 decreased as the temperature increased from 20&#176;C (36.1 days) to 35&#176;C (13.9 days). The degradation rate coefficient increased as the temperature increased. The predicted data derived from the model showed greater values than the observed data. The half-life of permethrin in Soil 6 decreased as the soil moisture increased from 30% (26.8 days) to 80% (20.1 days). The dissipation rate was not very different between the predicted and the observed data at 80% field capacity and at the temperature of 35&#176;C, and it consequently became closer when the incubation period was prolonged. 
ER  -

