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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
27/07/1995 |
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Data da última atualização: |
27/07/1995 |
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Autoria: |
LAFLEUR, K. S.; McCASKILL, W. R.; GALE JUNIOR, G. T. |
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Título: |
Trifluralin persistence in Congaree soil. |
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Ano de publicação: |
1978 |
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Fonte/Imprenta: |
Soil Science, v.126, n.5, p.285-289, 1978. |
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Idioma: |
Inglês |
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Conteúdo: |
A 200-1/ha aqueous emulsion containing 2 kg/ha of formulated trifluralin (treflan EC) was sprayed on three .01-ha Congaree sl plots. The trifluralin was incorporated by hand raking. The trifluralin content of the top meter of soil and underlying groundwater was monitored for 1024 days. Rainfall during this period was 420 cm. After placement, trufluralin seemed to remain within the top 20-cm soil layer, while its cocentration decreased nonlinearly with time. the herbicide disappeared from soil in two episodes, clearly delineated by a semilog plot: a relatively rapid, relatively brief (~1 mo) episode; and relatively slow, long (99 percent loss 72 mo) episode. Half-lives of these episodes were 19 days (initial) and about 450 days (steady state). Complementary sorption and movement in soil column studies supplied additional data for an attempt to characterize trifluralin dissipation in the field. Soil may be a greater repository of trace amounts of pesticides than hitherto suspected. Two-stage, or multistage, firsta-order kinetics may provide a more suitable model for predicting residue dissipation than the simple first-order kinetics model. |
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Palavras-Chave: |
Comportamento; Congaree soil; Pesticide. |
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Thesagro: |
Pesticida; Solo. |
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Thesaurus Nal: |
behavior; trifluralin. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01717naa a2200229 a 4500
001 1785081
005 1995-07-27
008 1978 bl --- 0-- u #d
100 1 $aLAFLEUR, K. S.
245 $aTrifluralin persistence in Congaree soil.
260 $c1978
520 $aA 200-1/ha aqueous emulsion containing 2 kg/ha of formulated trifluralin (treflan EC) was sprayed on three .01-ha Congaree sl plots. The trifluralin was incorporated by hand raking. The trifluralin content of the top meter of soil and underlying groundwater was monitored for 1024 days. Rainfall during this period was 420 cm. After placement, trufluralin seemed to remain within the top 20-cm soil layer, while its cocentration decreased nonlinearly with time. the herbicide disappeared from soil in two episodes, clearly delineated by a semilog plot: a relatively rapid, relatively brief (~1 mo) episode; and relatively slow, long (99 percent loss 72 mo) episode. Half-lives of these episodes were 19 days (initial) and about 450 days (steady state). Complementary sorption and movement in soil column studies supplied additional data for an attempt to characterize trifluralin dissipation in the field. Soil may be a greater repository of trace amounts of pesticides than hitherto suspected. Two-stage, or multistage, firsta-order kinetics may provide a more suitable model for predicting residue dissipation than the simple first-order kinetics model.
650 $abehavior
650 $atrifluralin
650 $aPesticida
650 $aSolo
653 $aComportamento
653 $aCongaree soil
653 $aPesticide
700 1 $aMcCASKILL, W. R.
700 1 $aGALE JUNIOR, G. T.
773 $tSoil Science$gv.126, n.5, p.285-289, 1978.
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Registro original: |
Embrapa Pantanal (CPAP) |
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