Napropamide Adsorption, Desorption, and Movement in Soils

Wu, Chu-Huang; Buehring, Normie W.; Davidson, J. M.; Santelmann, P. W.

doi:10.1017/s0043174500065000

Cited by 23 publications

(6 citation statements)

References 12 publications

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“…The correlations in Table 3 show that the present results are consistent with those of Hurle & Lang (1 98 1) and demonstrate a significant positive correlation between the half-lives and the adsorption distribution coefficients. Adsorption was positively correlated with the clay and organic matter contents of the different soils, as reported previously by Wu, Buerhing, Davidson & Santelmann (1975). Table 3 Soil properties Correlation coefficient ( th soil properties and: In addition to variations in half-life of napropamide between the different soils, there were also marked differences in phytotoxicity of the herbicide.…”

Section: Resultssupporting

confidence: 78%

Persistence and phytotoxicity of napropamide residues in soil

Walker¹,

Brown²,

Mathews³

1985

Annals of Applied Biology

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The time for 50% loss of napropamide following incorporation into a sandy loam soil in the field varied from about 130 days when applied in spring or early summer to over 200 days when applied later in the year. When left on the soil surface, up to 75% of the applied dose was lost during the first 28 days after application in June or July, whereas losses following application in November, December or January represented less than 25% of the amounts applied. These losses following surface application were closely correlated with the amounts of incoming solar radiation. First-order half-lives for degradation in nine soils incubated moist at 20°C in the laboratory varied from 72 to 150 days. They were positively correlated with the extent of herbicide adsorption by the soils and with their clay content, and negatively correlated with soil pH. Phytotoxicity to wheat and barley in the same soils in glasshouse experiments was inversely related to their organic matter content and to the extent of herbicide adsorption. Wheat was more tolerant of the herbicide than was barley. The results are discussed in terms of possible carryover problems with napropamide in some crop rotations. 1985 Association of Applied Biologists

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Section: Resultssupporting

confidence: 78%

Persistence and phytotoxicity of napropamide residues in soil

Walker¹,

Brown²,

Mathews³

1985

Annals of Applied Biology

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“…Rahman and Matthews (5), working with 13 s -triazines, showed that soil organic matter influenced the phytotoxicity of compounds with lower water solubilities more than those of higher solubility. Wu et al (8) found that addition of a muck soil to a sand (2%, w/w) significantly increased adsorption of napropamide [2 -(0:-naphthoxy) -N,N -diethylpropionamide] and decreased napropamide desorption.…”

Section: Introductionmentioning

confidence: 99%

Adsorption, Desorption, and Mobility of Metolachlor in Soils

Obrigawitch

Hons

Abernathy³

et al. 1981

Weed sci.

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Metolachlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide] has considerable potential for yellow nutsedge (Cyperus esculentusL.) control in crops commonly produced in the Texas High Plains. Little information is available, however, concerning adsorption characteristics of metolachlor in soils of this region. Adsorption and movement of metolachlor were determined in three commonly occurring soils of the Texas High Plains. Organic carbon contents of the soils by weight varied from 0.3 to 0.5%, and the clay fraction ranged from 16 to 33%. Freundlich adsorption isotherms exhibited two linear regions for each soil, suggesting the possibility of multilayer adsorption. K′ocvalues and coefficients of determination for organic carbon and clay content vs. Freundlich K values indicated that organic matter was the predominant adsorbent for metolachlor in the soils studied. Desorption, soil column leaching, and thin-layer plate studies demonstrated metolachlor to be sufficiently mobile in scils low in organic matter to cause possible crop injury or loss of efficacy.

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“…This can be attributed to irreversibility or hysteresis during desorption. This is a common trend and has been reported for the desorption of a number of pesticides like atrazine (Swanson and Dutt, 1973;Raman et al, 1988), prometryn (Murray et al, 1975 andLaFleur, 1976), thiabendazole (Aharonson and Kafkafi, 1976), napropamide (Wu et al, 1975), 2,4,5-T (Koskinen et al, 1979;Koskinen and Cheng, 1983), fluormetryn (Savage and Wauchope, 1974) and parathion (Saltzman et al, 1972).…”

Section: Resultsmentioning

confidence: 60%

Desorption of soil‐applied metoxuron from four soils of hyderabad

Raman

Patnaik

1994

Toxicological & Environmental Chemistry

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Adsorption and desorption of metoxuron (3-(3-chloro, 4-methoxyphenyl)-1, 1-dimethyl urea) was studied on two black and two red soils from Hyderabad, India, at 27 ± 1°C. Desorption was carried out by successive withdrawal of 5 mL of the supernatant and replacement by 0.01 M CaCl 2 solution. Desorption was accompanied by hysteresis in all the soils although the degree of irreversibility was lower in the red soils with lower clay and organic matter content. Desorption isotherms were closer to adsorption isotherms when the initial concentration of adsorbed metoxuron was low. Thus at the concentration used in weed control, large accumulation of metoxuron in "bound" or unavailable form does not appear to be serious.

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Napropamide Adsorption, Desorption, and Movement in Soils

Cited by 23 publications

References 12 publications

Persistence and phytotoxicity of napropamide residues in soil

Persistence and phytotoxicity of napropamide residues in soil

Adsorption, Desorption, and Mobility of Metolachlor in Soils

Desorption of soil‐applied metoxuron from four soils of hyderabad

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