Effect of Wetting/Drying Cycles on Dissipation Patterns of Bioavailable Imazaquin

Baughman, Todd A.; Shaw, David R.

doi:10.1017/s0043174500094030

Cited by 41 publications

(27 citation statements)

References 18 publications

(5 reference statements)

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“…Miles et al (1984) have also attributed the slower dissipation of chlorfenvinphos in dry soil as compared to moist soil, to lower microbial activity. Similar results have also been reported for 2,4-D (Johnson et al, 1995), imazaquin (Baughman and Shaw, 1996), chlorothalonil (Choudhury and Awasthi, 2000) and b-cyfluthrin (Gupta and Gajbhiye, 2002). However, such dry conditions are not likely to occur in fields under cropped conditions.…”

Section: Resultssupporting

confidence: 85%

Persistence of Acetamiprid in Soil

Gupta

Gajbhiye

2007

Bull Environ Contam Toxicol

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Section: Resultssupporting

confidence: 85%

Persistence of Acetamiprid in Soil

Gupta

Gajbhiye

2007

Bull Environ Contam Toxicol

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“…2b). It has been suggested that soil moisture conditions affected the microbial activity on the degradation of pesticides in soil (Baughman & Shaw 1996; Karpouzas & Walker 2000). However, there was little difference in pethoxamid degradation in soil under different soil moisture conditions, although the reason for the difference in the rate of decrease of pethoxamid activity between the soil water and the soil solid phase has not been clarified yet.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, it has been reported that soil moisture affected the time‐course degradation of imidazolinone (Curran et al . 1992) and imazaquin (2‐[4,5‐dihydro‐4‐methyl‐4‐(1‐methylethyl)‐5‐oxo‐1 H ‐ imidazol‐2‐yl]‐3‐quinolinecarboxylic acid; Baughman & Shaw 1996). However, these reports have provided little information on the relationship between the residual phytotoxic activity and the behavior of soil‐applied herbicides under different moisture conditions in soil.…”

Section: Introductionmentioning

confidence: 99%

Residual phytotoxic activity of pethoxamid in soil and its concentration in soil water under different soil moisture conditions

Dhareesank

Kobayashi

Usui

2006

Weed Biology and Management

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The relationship between the residual phytotoxic activity of pethoxamid (2-chloro-N-[2-ethoxyethyl]-N-[2-methyl-1-phenyl-1-propenyl] acetamide) on rice (Oryza sativa cv. Kiyohatamochi) seedlings and its behavior in soil was investigated under different moisture conditions. The phytotoxic activity of pethoxamid on the shoot growth of rice seedlings in soil was higher in 80% soil moisture content than in 70% and 60% soil moisture contents. The phytotoxic activity in soil in 70% and 80% soil moisture conditions decreased with the increasing time after application, but the phytotoxic activity was slight in 50% soil moisture conditions at any given time after application. The residues of pethoxamid in soil water, the amount adsorbed on soil solid, and the amount in total soil was reduced with the time after application in a similar manner among these soil moisture conditions. The residual phytotoxic activity of pethoxamid on the shoot growth of rice seedlings in soil was more highly correlated with the concentration in soil water than with the amounts adsorbed on soil solid and in total soil. The partition coefficients between the amounts of pethoxamid adsorbed on soil solid and its concentration in soil water were similar among the soils with different moisture conditions at each day, and the partition coefficient increased with the time after application. These results suggested that the residual phytotoxic activity of pethoxamid in soil depends on the decreasing concentration of pethoxamid in soil water with time, except in low soil-moisture conditions, which were insufficient for seedling growth.

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“…Weeds less susceptible to imazethapyr were not controlled satisfactorily in a sandy loam soil when there was no rain for 7–10 d after application, as no soil residual water was available to initiate herbicidal activity (Ayeni et al ., 1998). For imazaquin, a decrease in soil moisture would cause more herbicide to be sorbed and, as a result, would decrease bioavailability (Baughman & Shaw, 1996).…”

Section: Soil‐bound and Extracted Imazaquinmentioning

confidence: 99%

Imazaquin mobility in tropical soils in relation to soil moisture and rainfall timing

Regitano¹,

Prata²,

Rocha³

et al. 2002

Weed Research

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Summary This research studied the influence of soil type, soil moisture and incubation time before rain on the mobility of imazaquin in two highly weathered tropical soils, named clay and sandy clay. The soils were packed in glass columns and treated at three different moisture contents. Then, the applied imazaquin (150 g a.i. ha−1) was incubated for 0, 1 and 30 d before rainfall simulation began. Leaching was significantly higher in the sandy clay soil, when imazaquin was applied to moist samples and rainfall occurred soon after application (in this case, 73.4% of applied imazaquin was leached). Leaching was always low in the clay soil (in all cases, <1.8% of applied imazaquin was leached). In addition, imazaquin leaching potential was overestimated by the low Kd value (1.24 L kg−1) measured for the clay soil using batch equilibration data. For this soil, the vacuum displacement method also failed to predict leaching (in this case, 28.9% of applied imazaquin was leached). Consequently, batch equilibration and vacuum displacement methods cannot be used to predict leaching of anionic organic molecules, such as imazaquin, in fine‐textured tropical soils. Moreover, soil type and weather patterns or irrigation timing must be considered before imazaquin application to avoid environmental or carry‐over problems and to achieve maximum effectiveness of the herbicide.

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Effect of Wetting/Drying Cycles on Dissipation Patterns of Bioavailable Imazaquin

Cited by 41 publications

References 18 publications

Persistence of Acetamiprid in Soil

Persistence of Acetamiprid in Soil

Residual phytotoxic activity of pethoxamid in soil and its concentration in soil water under different soil moisture conditions

Imazaquin mobility in tropical soils in relation to soil moisture and rainfall timing

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