Trifluralin Movement in Runoff from a Small Agricultural Watershed

Rohde, W.; Asmussen, L. E.; Hauser, E. W.; Wauchope, R. D.; Allison, H. D.

doi:10.2134/jeq1980.00472425000900010011x

Cited by 59 publications

(52 citation statements)

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“…However, the benefits of the chemicals and some management options in agriculture must be balanced against potential contamination of surface water and groundwater resources. Concern over agricultural nonpoint source pollution of water resources has intensified with increased demand on water resources in agricultural systems (14,19,20,24).…”

Section: Introductionmentioning

confidence: 99%

Effects of different management practices on surface water quality from rice fields in south Louisiana∗

Feagley

Sigua

Bengtson

et al. 1992

Journal of Plant Nutrition

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Water samples collected in the Mermentau River Basin over several years at Lousiana Department of Environmental Quality monitoring sites contained high levels of total solids and nutrients during the spring that were highly correlated to pre-and post-plant discharges from rice fields. This study was developed to evaluate the potential of selected management practices (MP's) for reducing total solids, nutrients and pesticides from discharge water in order to improve the surface water quality in southwest Louisiana. Five rice plots located on the Rice Research Station in Crowley, LA represented the different MP's to be evaluated. The five water seeding MP's were: a.1-no till; a.2-water cultivation with 30-day settling; a.3-dry cultivation with clear water planting; a.4-mudding-in with vegetated filter, and b-mudding-in (control).Quality of discharged water from rice fields in the Mermentau River Basin was clearly affected by the different MP's. From the first year of data, all the MPa's were better than the mudding-in (MPb). The concentrations of the total solids (kg/ha) in the discharged water (initial + final drain) for the different MP's *Approved for publication by the Director of the Louisiana Agricultural Experiment Station as Manuscript Number 91-09-5511.

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Section: Introductionmentioning

confidence: 99%

Effects of different management practices on surface water quality from rice fields in south Louisiana∗

Feagley

Sigua

Bengtson

et al. 1992

Journal of Plant Nutrition

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“…Rhode et al (1980) found higher herbicide reduction in buffer strips during dry soil conditions. The correlation between the initial soil moisture and water retained on the plot occurred, but was low (r = 0.46), apparently due to differences in soil conditions.…”

Section: Conditions Of Each Surface Flow Simulation Are Presented Inmentioning

confidence: 84%

Streamside management zone (SMZ) efficiency in herbicide retention from simulated surface flow

et al. 2008

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-Plot-scale overland flow experiments were conducted to evaluate the efficiency of streamside management zones (SMZs) in retaining herbicides in runoff generated from silvicultural activities. Herbicide retention was evaluated for five different slopes (2, 5, 10, 15, and 20%), two cover conditions (undisturbed O horizon and raked surface), and two periods under contrasting soil moisture conditions (summer dry and winter wet season) and correlated to O horizon and site conditions. Picloram (highly soluble in water) and atrazine (moderately sorbed into soil particles) at concentrations in the range of 55 and 35 µg L -1 and kaolin clay (approximately 5 g L -1 ) were mixed with 13.000 liters of water and dispersed over the top of 5 x 10 m forested plots. Surface flow was collected 2, 4, 6, and 10 m below the disperser to evaluate the changes in concentration as it moved through the O horizon and surface soil horizon-mixing zone. Results showed that, on average, a 10 m long forested SMZ removed around 25% of the initial concentration of atrazine and was generally ineffective in reducing the more soluble picloram. Retention of picloram was only 6% of the applied quantity. Percentages of mass reduction by infiltration were 36% for atrazine and 20% for picloram. Stronger relationships existed between O horizon depth and atrazine retention than in any other measured variable, suggesting that better solid-solution contact associated with flow through deeper O horizons is more important than either velocity or soil moisture as a determinant of sorption.Keywords: pollution control, silviculture, pesticides, runoff.RESUMO -Experimento de escoamento superficial, em escala piloto, foi conduzido para se avaliar a eficiência de zonas ripárias (SMZs) na retenção de herbicidas presentes no escoamento superficial gerado em atividades silviculturais. A retenção do herbicida foi avaliada em terrenos com cinco diferentes declividades (2, 5, 10, 15 e 20%), duas condições de cobertura do solo (com e sem o horizonte O) e dois períodos de distintos teores de água no solo (verão seco e inverno úmido). Picloram (altamente solúvel em água) e atrazina (moderadamente adsorvível às partículas de solo), em concentrações na faixa de 55 e 35 µg L 1 , e caulinita (aproximadamente 5 g L -1 ) foram misturados com 13.000 litros de água e aplicados sobre o solo de áreas experimentais florestadas de 5 x 10 m. O escoamento superficial foi coletado a 2, 4, 6 e 10 m abaixo do ponto de aplicação, para que se pudesse avaliar as mudanças nas concentrações dos contaminantes na suspensão em escoamento. Resultados mostraram que, em média, faixas de 10 m de comprimento de SMZ florestada foram capazes de proporcionar remoção em torno de 25% na concentração inicial de atrazina e foram, geralmente, ineficientes na remoção de picloram, sendo essa remoção de apenas 6% do total aplicado. As reduções percentuais de massa, com a infiltração da suspensão no solo, foram de 36% apara a atrazina e 20% para o picloram. Existe forte relação entre profundidade 132 do h...

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“…Stating that trifluralin degradation is linked to humidity and temperature, Jolley and Johnstone, (1994) found increased resistance of trifluralin in drought years. Additionally, Rohde et al, (1980) found that the trifluralin amount lost to surface flow was very limited, and that much higher trifluralin concentrations were reached under conditions of the sprinkler irrigation application compared to flow formed after natural rainfall.…”

Section: Discussionmentioning

confidence: 98%

Study on Movement and Accumulation of Trifluralin in Medium-Textured Soils

Cebi¹,

Çakır

Tok

2017

Turkish JAF Sci.Tech.

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The aim of the study was to evaluate the movement and accumulation of 2,6 -dinitro -NN -dipropyl -4 -trifluoromethylanil (trifluralin) in soil under irrigated conditions. Despite its hazardous effects this herbicide is widely used in the country. The herbicide researched, is known to be one of the most resistant and least mobile pesticides used in the country. The investigations were carried out, using drainage type lysimeters with application of two different doses of trifluralin and three irrigation water levels. Irrigations were applied during three stages used as indicators for irrigation scheduling of the sunflower crop. Disturbed and undisturbed soil samples were taken from the original field in the beginning and from the tanks after completing of the study. Trifluralin analyses were completed using gas chromatography technique. The results of the study determined that the amounts of the herbicide and its degradation product (2-ethyl-4-nitro-6-trifluoromethyl-1H-benzimidazole) in the ranges of 3.04 -0.1 and 4.128-0.344 ppm, respectively were accumulated in the lysimeter soils during the 5-year research period. The highest amounts of trifluralin and its degradation product were measured in the 0-30 cm soil layer, of the treatment with higher applied herbicide amount and deficit irrigation.

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Trifluralin Movement in Runoff from a Small Agricultural Watershed

Cited by 59 publications

References 0 publications

Effects of different management practices on surface water quality from rice fields in south Louisiana∗

Effects of different management practices on surface water quality from rice fields in south Louisiana∗

Streamside management zone (SMZ) efficiency in herbicide retention from simulated surface flow

Study on Movement and Accumulation of Trifluralin in Medium-Textured Soils

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