Effect of weed water stress on postemergence herbicide activity

Oyarzabal, E. S.

doi:10.31274/rtd-180813-12177

Cited by 9 publications

(11 citation statements)

References 153 publications

(90 reference statements)

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“…Temperatures were designated as LT and HT with 20/15 C and 32/22 C day/ night temperatures, respectively. A soil water content release curve was developed from procedures modified from Oyarzabal (1991) for the soil-sand-peat mixture in order to maintain plants at a soil water content of FC (20.3 kPa) or drought stressed (DS) (25 to 210 kPa). The soil moisture curve was determined using a tension table in the low suction range (0.0001 to 0.1 mPa) and with a ceramic pressure plate apparatus in the high suction range (0.1 to 1.5 mPa) and applied to the van Genuchten equation, thus describing the relationship between matric potential and the volumetric soil water content (van Genuchten 1980).…”

Section: Methodsmentioning

confidence: 99%

Environmental Effects on Velvetleaf (Abutilon theophrasti) Epicuticular Wax Deposition and Herbicide Absorption

2011

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Controlled environment experiments showed that velvetleaf plants grown under drought stress or low temperature (LT) treatments had greater leaf epicuticular wax (ECW) deposition compared to plants grown in soil with moisture at field capacity (FC) or a high temperature (HT) regime. Light intensity did not affect ECW deposition; however, increasing light intensity decreased the leaf ECW ester content and increased the secondary alcohol content. Plants grown at an LT regime or under FC had leaf ECW with fewer hydrocarbons and more esters than those grown at an HT or drought stress regime. Velvetleaf absorption of acifluorfen increased as light intensity decreased for plants grown in adequate soil water content, while the opposite was true for drought-stressed plants. Velvetleaf absorption of acifluorfen was approximately 3 and 10 times greater, respectively, with the addition of 28% urea ammonium nitrate (UAN) in comparison to crop oil concentrate (COC) or no adjuvant, regardless of the environmental treatments. Plants absorbed more acifluorfen when subjected to the LT regime in comparison to the HT regime when UAN was the adjuvant, while the opposite was true when COC was the adjuvant. Velvetleaf absorption of acifluorfen was not affected by drought stress when COC or no adjuvant was used and varied between studies when UAN was used. Velvetleaf absorption of bentazon was greatest for plants grown under HT/FC or high light/FC treatments and least with plants grown under HT/drought stress or low light/drought stress treatments, regardless of the adjuvant. However, bentazon absorption was higher with the addition of an adjuvant and for plants grown at a high light intensity or FC condition compared with medium to low light intensity or drought stress treatments.

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Section: Methodsmentioning

confidence: 99%

Environmental Effects on Velvetleaf (Abutilon theophrasti) Epicuticular Wax Deposition and Herbicide Absorption

2011

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“…Soil subsamples were taken during pot filling and oven-dried to determine the initial soil moisture content. A moisture retention curve was developed for the soil mixture using a tension table in the low suction range (0.0001 to 0.1 MPa) and a ceramic pressure plate apparatus in the high suction range (0.1 to 1.5 MPa) (15). Desorption data were used to solve the Van Genuchten equation, which describes the relationship between matrix potential and the volumetric soil water content (21) using the nonlinear regression (NLIN) proce dure of SAS (18).…”

Section: Methodsmentioning

confidence: 99%

Effect of Moisture Stress and Leaf Age on Bentazon Absorption in Common Cocklebur (Xanthium strumarium) and Velvetleaf (Abutilon theophrasti)

Levene

Owen

1995

Weed sci.

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More than 70% of all14C-bentazon absorption occurred within 4 h after herbicide application regardless of adjuvant Moisture stress reduced14C-bentazon absorption by common cocklebur and velvetleaf. Mature (second true leaf) and moisture-stressed leaves of velvetleaf had 50 and 17 μg cm−1more epicuticular wax (ECW) than did juvenile and unstressed leaves, respectively. Common cocklebur had less14C in the ECW and lower total14C in treated mature leaves compared to juvenile leaves. The use of 28% urea ammonium nitrate (UAN) or crop oil concentrate (COC) increased14C in ECW samples of both plant species, regardless of leaf age or moisture stress. More14C in the ECW did not always correlate with more14C in the leaf tissue. Adjuvants increased14C-bentazon absorption into leaves of plants that had been stressed.

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“…Low temperatures were designated as 20/15 C (day/night), and high temperatures were designated as 32/22 C (day/ night). A soil moisture release curve was developed as described by Oyarzabal (1991) for the pasteurized 3 : 1 : 1 (v : v : v) soil : sand : peat mixture at Ϫ0.33, Ϫ5, Ϫ10, and Ϫ15 kPa to maintain plants at a field capacity (Ϫ0.33 kPa) or drought stressed (Ϫ5 to Ϫ10 kPa) soil moisture regime.…”

Section: Plant Materialsmentioning

confidence: 99%

Effect of environment on giant foxtail (Setaria faberi) leaf wax and fluazifop-P absorption

Hatterman‐Valenti

Pitty

Owen³

2006

Weed sci.

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Controlled-environment experiments were conducted to determine giant foxtail epicuticular wax (ECW) deposition and fluazifop-P absorption under different environmental conditions and with two adjuvants. Drought stress and low temperature increased leaf ECW content, whereas low light intensity decreased ECW content compared with medium light intensity. Drought stress conditions decreased the fatty acid and primary alcohol content of ECW and increased the hydrocarbon content compared with field capacity. Compositional changes would make the ECW more hydrophobic and reduce leaf wetting by herbicide spray. Increasing air temperature decreased the aldehyde content of ECW, whereas decreasing light intensity increased ECW fatty acid and aldehyde content while decreasing primary alcohols and esters. Compositional changes under low light intensity would make the ECW more hydrophilic and increase leaf wetting by a herbicide spray. Drought stress reduced fluazifop-P absorption regardless of the temperature but could not further reduce fluazifop-P absorption under low light intensity. Fluazifop-P absorption by plants under low light and drought stress conditions was similar to plants under low or medium light intensity and field capacity conditions. Similarly, the rate of fluazifop-P absorption was less under drought stress and low light conditions. Fluazifop-P absorption was greater when crop oil concentrate was added compared with 28% urea ammonium nitrate or no additive. Crop oil concentrate, added to the herbicide solution, overcame reduced fluazifop-P absorption under the low light conditions and in one of the two drought stress regimes but could not overcome reduced fluazifop-P absorption with the high temperature regime.

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Effect of weed water stress on postemergence herbicide activity

Cited by 9 publications

References 153 publications

Environmental Effects on Velvetleaf (Abutilon theophrasti) Epicuticular Wax Deposition and Herbicide Absorption

Environmental Effects on Velvetleaf (Abutilon theophrasti) Epicuticular Wax Deposition and Herbicide Absorption

Effect of Moisture Stress and Leaf Age on Bentazon Absorption in Common Cocklebur (Xanthium strumarium) and Velvetleaf (Abutilon theophrasti)

Effect of environment on giant foxtail (Setaria faberi) leaf wax and fluazifop-P absorption

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