Dissipation of the Herbicides Pendimethalin and Oryzalin in Soil

Wen-Ching Chen ； Bing-Sheng Chen ； Hsin-Chien Chen ； Jui-Hung Yen

《農林學報》 66卷3,4期 (2018/12) Pp. 153-166

https://doi.org/10.30089/JAF.201812_66(3_4).0003

摘要

We investigated the fate of the herbicides pendimethalin and oryzalin in soil in terms of possible contamination of soils and groundwater. The mobility and dissipation of the herbicides were examined under different moisture contents (30%, 60% and 90% water-holding capacity), incubation temperatures (10, 25 and 40℃) and s oil types ( Clu loam, Sa c lay loam and Ycl sandy clay loam). Increasing temperature and soil water-moisture content shortened the half-lives of herbicides in treated soils. We assessed the possibility of the herbicides polluting groundwater by the behavior assessment model (BAM) and groundwater pollution potential (GWP) model. Both herbicides in soil columns were detected at 0 to 6 cm. BAM simulation results showed that oryzalin moved faster than pendimethalin. GWP simulation results indicated the greater possibility of oryzalin contaminating groundwater. Contamination of soils and groundwater by herbicides depends on the characteristics of the herbicides, temperature and soil characteristics.

關鍵字

Pendimethalin ； Oryzalin ； Dissipation ； Behavior assessment model (BAM) ； Groundwater pollution potential model (GWP)