Effect of application methods on movement and degradation of aldicarb residues in Maine potato fields

Jones, Russell L.; Hansen, James L.; Rourke, R. V.

doi:10.1002/etc.5620050207

Cited by 24 publications

(2 citation statements)

References 2 publications

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“…The estimated degradation rates so estimated for the two plots correspond to half-lives of 0.9 and 1 .O months for the planting and emergence applications, respectively. The finding of essentially the same half-life for both planting and emergence at the Phelps site at first may seem inconsistent with other studies which indicate slower rates of degradation for applications at planting [8,10]. However, the planting application was made in June rather than the normal time of late April or May due to wet fields, so little difference would be expected in the two half-lives that were observed.…”

Section: Results Of the Field Studycontrasting

confidence: 61%

Field Research on Aldicarb Management Practices for Upstate New York

Porter

Wagenet

Jones

et al. 1990

Environ Toxicol Chem

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The need to develop aldicarb management practices in upstate New York potato fields, which would continue the benefits associated with the pesticide while protecting drinking water wells, led to a three‐part research program conducted in 1983: Samples from 57 wells and three test holes were collected near potato fields in six counties; aldicarb residues were monitored in water from a tile‐drained field near Willsboro; and a study of aldicarb residues in the unsaturated zone was conducted in a potato field near Phelps. Results show that aldicarb residues from applications made in June degrade with a half‐life of about one month in surface soils. The persistence and transport of aldicarb residues from these later applications is shown to be less compared to the usual previous practice of applying aldicarb at planting. The potable well sampling indicates that where applications are made at the usual planting time in midspring, aldicarb residues may appear in drinking water wells located very near the treated fields. The results of this and other related studies confirm the soundness of later applications of aldicarb when the soils are warmer and when there is less soil water percolation. This practice is embodied in the current North Eastern regulations, which require application of aldicarb at plant emergence and prohibit applications within 150 m of drinking water wells.

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Section: Results Of the Field Studycontrasting

confidence: 61%

Field Research on Aldicarb Management Practices for Upstate New York

Porter

Wagenet

Jones

et al. 1990

Environ Toxicol Chem

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“…Consequently, if all other factors are held constant, atrazine and DEA are more likely to persist long enough to reach groundwater if the atrazine is applied in cool climates or at cool times of the year than if the herbicide is applied in warm climates or during warm seasons. Several authors have suggested that the effect of temperature may be reinforced by the effects of recharge because cold seasons often coincide with periods of greater precipitation than warm seasons (e.g., Wyman et al, 1985; Jones et al, 1986; Priddle et al, 1989, 1992; Pickett et al, 1990; Porter et al, 1990; Traub‐Eberhard et al, 1994). However, the present study did not observe a statistically significant interaction between airtemp and recharge ( p = 0.94), indicating that the effects of temperature on atrazine residue concentrations in groundwater are independent of the amount of recharge received.…”

Section: Resultsmentioning

confidence: 99%

Regression Models for Estimating Concentrations of Atrazine plus Deethylatrazine in Shallow Groundwater in Agricultural Areas of the United States

et al. 2012

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Tobit regression models were developed to predict the summed concentration of atrazine [6-chloro-N-ethyl-N'-(1-methylethyl)-1,3,5-triazine-2,4-diamine] and its degradate deethylatrazine [6-chloro-N-(1-methylethyl)-1,3,5,-triazine-2,4-diamine] (DEA) in shallow groundwater underlying agricultural settings across the conterminous United States. Th e models were developed from atrazine and DEA concentrations in samples from 1298 wells and explanatory variables that represent the source of atrazine and various aspects of the transport and fate of atrazine and DEA in the subsurface. One advantage of these newly developed models over previous national regression models is that they predict concentrations (rather than detection frequency), which can be compared with water quality benchmarks. Model results indicate that variability in the concentration of atrazine residues (atrazine plus DEA) in groundwater underlying agricultural areas is more strongly controlled by the history of atrazine use in relation to the timing of recharge (groundwater age) than by processes that control the dispersion, adsorption, or degradation of these compounds in the saturated zone. Current (1990s) atrazine use was found to be a weak explanatory variable, perhaps because it does not represent the use of atrazine at the time of recharge of the sampled groundwater and because the likelihood that these compounds will reach the water table is aff ected by other factors operating within the unsaturated zone, such as soil characteristics, artifi cial drainage, and water movement. Results show that only about 5% of agricultural areas have greater than a 10% probability of exceeding the USEPA maximum contaminant level of 3.0 μg L −1 . Th ese models are not developed for regulatory purposes but rather can be used to (i) identify areas of potential concern, (ii) provide conservative estimates of the concentrations of atrazine residues in deeper potential drinking water supplies, and (iii) set priorities among areas for future groundwater monitoring.

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Unsaturated zone studies of the degradation and movement of aldicarb and aldoxycarb residues

Jones

Hansen

Romine

et al. 1986

Enviro Toxic and Chemistry

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Unsaturated zone studies to measure the movement and degradation of aldicarb and aldoxycarb residues were conducted in 1983 at seven locations: Maricopa, Arizona; Harrellsville, North Carolina; Blackstone, Virginia; Blissfield, Michigan; Bluecast, Indiana; Pasco, Washington; and Fort Pierce, Florida. The Blissfield and Bluecast studies also included monitoring of tiledrain water and the Fort Pierce test included shallow ground water analyses. These research studies indicate that aldicarb or aldoxycarb residues will not enter drinking water supplies under agricultural conditions similar to those encountered in these seven field studies. Most, if not all, of the residues will degrade in the unsaturated zone at a rate corresponding to half-lives of between 0.5 and 2.0 months. The field studies also demonstrate that aldicarb and aldoxycarb residues degrade at about the same rate.

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Effect of application methods on movement and degradation of aldicarb residues in Maine potato fields

Cited by 24 publications

References 2 publications

Field Research on Aldicarb Management Practices for Upstate New York

Field Research on Aldicarb Management Practices for Upstate New York

Regression Models for Estimating Concentrations of Atrazine plus Deethylatrazine in Shallow Groundwater in Agricultural Areas of the United States

Unsaturated zone studies of the degradation and movement of aldicarb and aldoxycarb residues

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