Variability of Flow and Solutes in the Rattaphum Catchment (Songkhla Lake Basin), Thailand |
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Authors: | N Panapitukkul W Chatupote |
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Institution: | (1) Faculty of Natural Resources, Prince of Songkhla University, Hat Yai, Songkhla, Thailand |
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Abstract: | Pesticides can have a number of adverse impacts on crops, soil and water. In this paper, we focus on the physical and hydraulic
properties of soils controlling the leaching of pesticides into the shallow groundwater of the Rattaphum Catchment in Thailand.
Results from an analysis of soil physical properties, hydraulic conductivity, dye tracer and bromide tests show that the top
10–30 cm of soils in the three agro-ecosystems (vegetables, fruits and rubber) have a high clay and organic carbon content
and are relatively impermeable with very low hydraulic conductivity (15–40 cm/day). Most of the dye and bromide were retained
in the top clayey layer; the bromide forming a miniature bulge below 30 cm in two profiles which dissipated after 30 days,
while the pesticides were mainly confined to the top 10 cm. |
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Keywords: | bromide and pesticides leaching dye tracer test groundwater soil properties |
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