Impact of pesticide use in lowland rice fields on ground water quality.
1993
Castaneda A.R. | Bhuiyan S.
Ninety eight percent of well water samples collected in 1989 WS [wet season] in SCRIS were detected to contain endosulfan residue while 76% contained butachlor. Lesser samples contained the same residues in 1990 DS [dry season]. In UPRIIS [Upper Pampanga River Irrigation System] much lowered well-water samples containing pesticide residues were detected: carbofuran was detected in only 19% during the 1990 WS and no detection during the 1991 DS. The maximum concentrations in SCRIS were 1.14 ppb (butachlor) in 1989 WS and 1.15 ppb (carbofuran) in 1990 DS. Higher mean concentrations were observed to be consistent with the observed maximum concentration of 0.073 ppb (butachlor) in 1989 WS and 0.095 ppb (carbofuran) and also the highest mean concentration 0.055 ppb (carbofuran) in 1990 WS. Higher percent detection and mean concentration in well-water samples seemed related to higher pesticide use and percolation rate in lowland ricefields.
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