Effect of Water Stress, Nitrogen, and Gibberellic Acid on Fluazifop and Glyphosate Activity on Oats (<i>Avena sativa</i>)

Dickson, Ross L.; Andrews, Mitchell; Field, R. J.; Dickson, Euan L.

doi:10.1017/s0043174500056113

Cited by 41 publications

(31 citation statements)

References 44 publications

(84 reference statements)

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“…Therefore, they suggested that restricted translocation was the physiological mechanism explaining the lower efficacy and that the cause was lower carbon assimilation at low nitrogen supplies. Results from experiments with oat sprayed with fluazifop or glyphosate indicated the same mechanism (Dickson et al. , 1990).…”

Section: Discussionmentioning

confidence: 96%

“…In the same study, it was observed that the susceptibility of A. theophrasti to atrazine did not change with nitrogen rate. Other studies have confirmed the interaction between herbicide efficacy and nitrogen application and have suggested that decreased translocation of herbicides out of treated leaves is the mechanism behind the interaction, but the results are equivocal and the interaction is not always evident (Dickson et al. , 1990; Kim et al.…”

Section: Introductionmentioning

confidence: 99%

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Influence of nitrogen rate on the efficacy of herbicides with different modes of action

2012

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Outdoor pot experiments and field experiments were conducted to examine the influence of nitrogen rate on herbicide efficacy. Growth of unsprayed Tripleurospermum inodorum increased with increasing nitrogen rate in pot experiments; increasing nitrogen also increased the susceptibility to tribenuron-methyl. An increased susceptibility at high nitrogen rate was also observed for Anagallis arvensis, but in contrast to T. inodorum, growth of unsprayed A. arvensis was unaffected by nitrogen rate. Growth of unsprayed Chenopodium album was also promoted by nitrogen supply. However, no influence of nitrogen rate on herbicide efficacy was evident for C. album with tribenuron-methyl or ioxynil+bromoxynil in pot experiments. Field experiments with tribenuron-methyl were conducted on natural populations of C. album in spring barley grown at different nitrogen rates showed similar results. In conclusion, nitrogen rate affected herbicide efficacy for some but not all combinations of weed species and herbicide. Decreased herbicide efficacy was only observed at very low nitrogen rates. The results suggest that the effect of nitrogen rates on herbicide efficacy will be marginal in intensive farming systems with high nitrogen supply, but in low intensity systems, weed patchiness might increase.

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Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Influence of nitrogen rate on the efficacy of herbicides with different modes of action

2012

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“…(Rioux et al ., 1974; Lemerle & Verbeek, 1995). Particular variables of importance include soil moisture stress (Boydston, 1990; Dastgheib et al ., 1990; Dickson et al ., 1990; Lemerle & Verbeek, 1995), nitrogen deficiency (Dickson et al ., 1990), temperature, light, wind, humidity and rainfall (Muzik, 1975; Doran & Andersen, 1976; Coupland, 1983, 1984; Merritt, 1984; Nalewaja & Woznica, 1985; Jensen & Kudsk, 1988; Devine, 1989; Caseley, 1990; Wicks et al ., 1993; McMullan, 1994; Madafiglio et al ., 2000). As a general principle, a lower dose of herbicide may kill most of the target weeds under favourable conditions.…”

Section: Introductionmentioning

confidence: 99%

Determination of environment‐specific dose–response relationships for clodinafop‐propargyl on Avena spp.

et al. 2001

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A range of plant and environmental variables is known to influence the efficacy of herbicides. This paper explores whether environmental factors influencing efficacy of a herbicide can be quantified by analysing a set of industry data involving 59 experiments conducted throughout Australia in the years 1986–1995 for clodinafop‐propargyl on Avena spp. A spline method was used to analyse the combined data set of observed and interpolated covariates. In addition to dose, it was found that efficacy was significantly influenced by maximum temperature on the day of application, spray water volume, the interaction of maximum temperature and spray volume, the sum of minimum temperatures experienced in the 7 days prior to application, and the soil moisture deficit estimated for day 10 prior to application. The findings are discussed in relation to testing of new products for providing commercial factor‐adjustment information as an additional, marketable outcome of existing product testing procedures. Advantages of the spline model over the commonly used log–logistic model for evaluating dose–response and factor‐adjustment relationships are presented.

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“…Herbicide efficacy as influenced by the N environment under which weeds were grown, however, has not been studied in the literature. Dickson et al (1990) reported that tame oats (Avena sativa L.) were more tolerant to fluazifop and glyphosate when grown under a low than a high N environment (1 vs. 10 mol N m Ϫ3 ). Although the effect of N on herbicide efficacy has been illustrated in tame oats, similar work has not been reported for weeds.…”

mentioning

confidence: 99%

Fertilizer nitrogen rate and the response of weeds to herbicides

Cathcart

Chandler

Swanton³

2004

Weed sci.

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Differences in plant community composition have been attributed to abiotic field characteristics, crop type, localized predation, farm implement traffic, and natural dispersal mechanisms. Nitrogen (N) fertilizer rates and herbicides also are known to influence weed community structure, although their interaction has not been reported in the literature. A growth room experiment was conducted using three weed species (green foxtail, redroot pigweed, and velvetleaf) and five herbicides (nicosulfuron, atrazine, glufosinate, glyphosate, and mesotrione) differing in their mode of action and efficacy to the selected species. The experiment was conducted in growth chambers with two levels of N fertilization (low: 0.7 mM N and high: 7.7 mM N). Weeds were grown to the two- to five-leaf stage (depending on species), treated with the appropriate herbicide, and harvested approximately 2 wk after treatment. The herbicide dose at which a 50% reduction in biomass occurred (GR50) was determined using log-logistic analysis. Herbicide susceptibility of the different weed species was influenced by N level. Green foxtail grown under low N required approximately six times the dose of nicosulfuron compared with plants grown under high N. Similarly, higher doses of nicosulfuron, glufosinate, mesotrione, and glyphosate were required to achieve a 50% reduction in redroot pigweed biomass grown under low N. In contrast, N did not influence the efficacy of mesotrione, glufosinate, or atrazine when applied to velvetleaf. This indicated specificity among herbicide–species combinations. Differences in herbicide efficacy resulting from soil N levels may alter weed community structure and may potentially explain possible weed control failures on farm fields.

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Effect of Water Stress, Nitrogen, and Gibberellic Acid on Fluazifop and Glyphosate Activity on Oats (Avena sativa)

Cited by 41 publications

References 44 publications

Influence of nitrogen rate on the efficacy of herbicides with different modes of action

Influence of nitrogen rate on the efficacy of herbicides with different modes of action

Determination of environment‐specific dose–response relationships for clodinafop‐propargyl on Avena spp.

Fertilizer nitrogen rate and the response of weeds to herbicides

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