Persistence of Linuron Residues in Soils at Kelligrews, Newfoundland

Morris, Ray F.; Penney, B. G.

doi:10.4141/cjps71-048

Cited by 7 publications

(6 citation statements)

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“…Other studies report rates of linuron dissipation of 100% loss in less than 3 months (26) to a 65% loss in 6 months (27). A "carryover" of linuron at phytotoxic levels to the following year has been reported (23). This was considered abnormal and attributed to weather conditions of the previous season.…”

Section: Introductionmentioning

confidence: 99%

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Detection and Degradation of Linuron in Organic Soils

Mapplebeck¹,

Waywell²

1983

Weed sci.

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Detection and degradation of linuron [3-(3,4-dichlorophenyl) -1 - methoxy -1 - methylurea] in organic soils were studied using biological assays and chromatographic techniques. The level of linuron that caused 50% growth reduction of onion (Allium cepa L.) varied among three soils of greatly differing organic matter contents. Linuron and its metabolites were successfully separated with florisil column chromatography using a five-fraction solvent system; however, only linuron and 3 - (3,4 - dichlorophenyl) -1 -methylurea could be extracted from organic soil samples at satisfactory recovery rates. Soil samples from eight grower fields and from field plots were analyzed to determine the residue level of these two compounds. Quantitative assessment of the compounds was made with high pressure liquid chromatography. Results of the biological assay and chromatographic analysis showed that linuron and its phytotoxic metabolite, 3 - (3,4 - dichlorophenyl) -1 - methylurea, were not accumulating in the organic soils of Ontario and that the levels detected were not phytotoxic to onions when grown in pot bioassays.

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Section: Introductionmentioning

confidence: 99%

“…There have been numerous studies examining the degradation of linuron in mineral soils (10,23,26,27,28). The rates of degradation in these soils vary greatly.…”

Section: Introductionmentioning

confidence: 99%

Detection and Degradation of Linuron in Organic Soils

Mapplebeck¹,

Waywell²

1983

Weed sci.

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“…The high carbonaceous and water contents of organic soils cause adsorption (Khan, 1974;Khan & Mazurkewich, 1974) and dilution of herbicides which result in decreased bio-activity, and increased persistence of the additives. The latter may jeopardize the environmental quality of an organic soil such as in making a linuron-treated field unsuitable for growing a susceptible crop such as cabbage in the following season (Morris & Penny, 1971). The low pH, abundance of C sources and of water, also make organic soils distinct from mineral soils as a habitat for the growth of microorganisms.…”

Section: Introductionmentioning

confidence: 99%

Influence of field‐applied linuron and paraquat on the microflora of an organic soil

Mathur¹,

Bélanger

Khan

et al. 1976

Weed Research

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R6sum6: ZusammenfassungIn a field experiment on an organic soil, a pre-emergence application of paraquat at 2-24 kg a.i. (active ingredient)/ha was made to a plot on which onions and lettuce were grown; and similar broadcast applications of linuron, both with and without carbofuran, at two field rates, to plots on which carrots were grown. Paraquat generally increased the bacterial and actinomycetal populations while linuron inhibited the same but enhanced the numbers of fungal propagules, although it decreased the proportion of soil penicillia in the population. The overall effect of linuron was not changed by the admixture of carbofuran. However, the changes in microbial populations by either herbicides were not substantial enough to make gross or lasting differences in levels of available N and P, and in the CO2 evolution rate.

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“…Residues of triazine herbicides such as atrazine (2-chIoro-4-ethylamino-6-isopropyiamino-1,3,5-triazine) and simazine (2-chloro-4,6-bisethylamino-l,3, 5-triazine), and urea herbicides such as linuron (7V'-(3,4-dichlorophenyl)-A^-methoxy-A'-methylurea) and diuron {A'"'-(3,4-dichl or phenyl)-A'^A'-di methylurea) can persist in the soil in amounts sufficient to damage sensitive crops the following year (Frank, 1966;Burnside et al, 1969;Upchurch, Corbin & Selman, 1969;Morris & Penney, 1971) and methods of detecting phytotoxic concentrations of these compounds prior to the planting of susceptible crops are often required. The amount of residues of these herbicides in soil is commonly determined by bioassay methods where the growth of plants of a susceptible species in soil containing an unknown amount of herbicide is compared to the growth in soil treated with known amounts of herbicide.…”

Section: Introductionmentioning

confidence: 99%

Detection of triazine and urea herbicide residues by various characteristics of oat seedlings in bioassays

Marriage

1975

Weed Research

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Resume: Zusammenfassung 292 P. B. Marriage Substanz von Haferpflanzen die in Proben des o.g. Bodens wuchsen, zeigte in 50% der Falle Ruckstande an in denen durch Bestimmung des Trockengewichts kein Herbizid angezeigt wurde. Das Gewicht an neutraler Substanzbezogen auf das Trockengewicht ^ war ein fast genauso empfindliches Merkmal. Die chemische Analyse des Bodens in dem die Testpflanzen weniger neutrale wasserlosliche Substanz anzelgten, ergab fur dieses Merkmal eine untere Erfassungsgrenze von 0,10 ppm.

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Persistence of Linuron Residues in Soils at Kelligrews, Newfoundland

Abstract: not available

Cited by 7 publications

References 0 publications

Detection and Degradation of Linuron in Organic Soils

Detection and Degradation of Linuron in Organic Soils

Influence of field‐applied linuron and paraquat on the microflora of an organic soil

Detection of triazine and urea herbicide residues by various characteristics of oat seedlings in bioassays

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