Desorption and Bioavailability of Aged Simazine Residues in Soil from a Continuous Corn Field

Scribner, Stephen L.; Benzing, Thomas R.; Sun, Shaobai; Boyd, Stephen A.

doi:10.2134/jeq1992.00472425002100020035x

Cited by 28 publications

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“…14 C-Simazine was absorbed and readily translocated until approximately 19 DAT (28 Apr. 2004) when the amount of 14 C-simazine in clippings began to decrease, probably because of a reduction in bioavailability as the chemical became sorbed to the soil colloids and as 14 C-simazine was degraded in soil (Scribner et al, 1992).…”

Section: C-labeled Simazine In Clippingsmentioning

confidence: 99%

“…Because simazine has very low water solubility, low volatility, and moderate to long soil half-life (DT 50 ) of 27 to 102 d, simazine may leach to groundwater (Ahrens, 1994;Tomlin, 2000). The major microbial transformation of s-triazine herbicides in soil is N-dealkylation (Scribner et al, 1992). Stearman et al (2003) demonstrated that wetland cells with plants removed 77.1% of the simazine applied, and cells without plants removed 64.3%.…”

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confidence: 99%

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Downward Mobility of ¹⁴C‐Labeled Simazine in a Bermudagrass System vs. a Fallow Soil System

et al. 2009

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Pesticides applied to bermudagrass (Cynodon dactylon L.) can be captured by the canopy, absorbed by the roots, or bound in the thatch layer, which reduces the amount available to leach compared with a fallow soil system where pesticides may be applied directly to soil. 14C‐Simazine was applied to dormant bermudagrass and fallow soil in lysimeters in a cold growth chamber (5°C) (cold‐fallow soil) and to actively growing bermudagrass and fallow soil in lysimeters in a greenhouse (25°C) (warm‐fallow soil) in April. Following clipping collection, lysimeters were irrigated with 5 cm of water every 3–4 d, and leachate was collected. After 25 d, lysimeters were divided into 2‐cm increments from 0 to 10 cm, then 5‐cm increments from 10 to 30 cm. Because of evapotranspiration, actively growing bermudagrass and warm‐fallow soil yielded significantly less leachate than dormant bermudagrass and cold‐fallow soil indicating less moisture is available for downward movement during summer. After the addition of 31 cm of irrigation, the greatest quantities of 14C‐simazine were in the 0‐ to 2‐cm increment for all treatments and decreased with depth. Although the greatest quantities of 14C‐simazine in leachate occurred in dormant bermudagrass, the reached factor was greatest for cold‐fallow soil (0.20), followed by dormant bermudagrass (0.17), warm‐fallow soil (0.16), and actively growing bermudagrass (0.14). Therefore, simazine is least mobile in bermudagrass during summer and most mobile in fallow soil in winter.

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Section: C-labeled Simazine In Clippingsmentioning

confidence: 99%

mentioning

confidence: 99%

Downward Mobility of ¹⁴C‐Labeled Simazine in a Bermudagrass System vs. a Fallow Soil System

et al. 2009

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“…Also, other studies have shown slow, incomplete mineralization for metolachlor (Bollag and Liu 1991). Strong adsorption of herbicides to soil has been shown to limit bioavailability to microorganisms (Scribner et al 1992), lowering microbial degradation.…”

Section: Mineralizationmentioning

confidence: 99%

Metolachlor fate and mobility in a tidal wetland soil

Seybold

Mersie

1999

Wetlands

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A study was conducted to determine the fate of the herbicide metolachlor in a tidal wetland soil located along the James River in Virginia, USA. Soil adsorption/desorption and mineralization characteristics and mobility of metolachlor were determined on the Levy tidal wetland soil. The metolachlor Ka value was 65.8 L kg ' and K~ value was 810 L kg ' C ~, which are much greater than would be found on typical agricultural soils. After four 24-h desorption periods, the total amount of metolaehlor that desorbed ranged from 16 to 22% of the amount initially adsorbed. Metolachlor mineralization was about 0.46% of the amount applied after 84 days, which indicates that it does not mineralize very readily in the Levy soil. The amount of mctolachlor that leached from the soil columns averaged 1,64% of the mnount applied alter 84 days, showing a low degree of mobility. These results suggest that the Levy tidal wetland soil can function as an eflective filter of metolachlor and other similar herbicides that enter via agricultural runoff, protecting surface and ground waters.

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“…In many cases, sorption has been shown to increase with aging (Cox et al, 1998;Mamy and Barriuso, 2007;Regitano and Koskinen, 2008;Scribner et al, 1992;Sharer et al, 2003), which could change the potential transport or risk classification (Oliveira et al, 2013). While most studies have been done with parent compound in surface soil, very few have been done with metabolites or in subsurface soil.…”

Section: Introductionmentioning

confidence: 99%

Changes in sorption of indaziflam and three transformation products in soil with aging

et al. 2015

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Desorption and Bioavailability of Aged Simazine Residues in Soil from a Continuous Corn Field

Cited by 28 publications

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Downward Mobility of ¹⁴C‐Labeled Simazine in a Bermudagrass System vs. a Fallow Soil System

Downward Mobility of ¹⁴C‐Labeled Simazine in a Bermudagrass System vs. a Fallow Soil System

Metolachlor fate and mobility in a tidal wetland soil

Changes in sorption of indaziflam and three transformation products in soil with aging

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Desorption and Bioavailability of Aged Simazine Residues in Soil from a Continuous Corn Field

Cited by 28 publications

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Downward Mobility of 14C‐Labeled Simazine in a Bermudagrass System vs. a Fallow Soil System

Downward Mobility of 14C‐Labeled Simazine in a Bermudagrass System vs. a Fallow Soil System

Metolachlor fate and mobility in a tidal wetland soil

Changes in sorption of indaziflam and three transformation products in soil with aging

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Product

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Downward Mobility of ¹⁴C‐Labeled Simazine in a Bermudagrass System vs. a Fallow Soil System

Downward Mobility of ¹⁴C‐Labeled Simazine in a Bermudagrass System vs. a Fallow Soil System