Influence of the Glyphosate Formulations on Wettability and Evaporation Time of Droplets on Different Targets

Oliveira, Rone Batista de; Dario, Gustavo; Alves, Karina Aline; Gandolfo, Marco Antonio

doi:10.1590/s0100-83582015000300022

Cited by 7 publications

(6 citation statements)

References 15 publications

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“…Also, the efficacy of isopropylamine, diammonium, and potassium salts of glyphosate does not differ on yellow nutsedge (Cyperus esculentus L.), I. lacunosa, broadleaf signalgrass [Brachiaria platyphylla (Munro ex C. Wright) Nash], and A. palmeri, even when some salts affected the pattern of absorption and translocation (Mueller et al 2006). Differences in absorption and translocation could be attributed to differences in leaf anatomy (Oliveira et al 2015) but do not always equate to differences in efficacy of control. The potassium and ammonium salt formulations resulted in higher leaf wetting when applied to hairy beggarticks (Bidens pilosa L.), while the isopropylamine salt formulation resulted in lower wettability of southern sandbur (Cenchrus echinatus L.) leaves (Oliveira et al 2015).…”

Section: Practical Implicationsmentioning

confidence: 99%

“…Differences in absorption and translocation could be attributed to differences in leaf anatomy (Oliveira et al 2015) but do not always equate to differences in efficacy of control. The potassium and ammonium salt formulations resulted in higher leaf wetting when applied to hairy beggarticks (Bidens pilosa L.), while the isopropylamine salt formulation resulted in lower wettability of southern sandbur (Cenchrus echinatus L.) leaves (Oliveira et al 2015). In waterhemp [Amaranthus tuberculatus (Moq.)…”

Section: Practical Implicationsmentioning

confidence: 99%

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Ammonium sulfate improves the efficacy of glyphosate on South African lovegrass (Eragrostis plana) under water stress

et al. 2021

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South African lovegrass (Eragrostis plana Nees) is the most important weed of native pastures in southern Brazil. Management options are limited under water stress conditions and glyphosate has been the main tool for control. This study compared four salts of glyphosate applied at three growth stages, and determined the glyphosate tolerance level. In addition, the performance of ammonium sulfate (AMS) under two soil moisture conditions (50% and 100% of water holding capacity), and the effect of AMS on absorption and translocation of radiolabeled 14C-glyphosate were evaluated. The potassium salt of glyphosate had the fastest activity across growth stages of E. plana, which is more vulnerable to glyphosate at panicle initiation stage. Isopropylamine salt was the slowest-acting glyphosate formulation. Younger plants were typically more easily controlled than older plants at full tillering stage. The addition of AMS increased the level of control of drought-stressed E. plana, compared to glyphosate alone, by increasing translocation out of the treated leaf and consequently increasing the concentration of glyphosate in the primary culm. This data can be used to plan an effective management program for E. plana considering the developmental stage of desired pasture grass species.

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Section: Practical Implicationsmentioning

confidence: 99%

Section: Practical Implicationsmentioning

confidence: 99%

Ammonium sulfate improves the efficacy of glyphosate on South African lovegrass (Eragrostis plana) under water stress

et al. 2021

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“…In Brazil, glyphosate is marketed as isopropylamine, dimethylamine, monoammonium, diammonium, and potassium formulations, though products containing isopropylamine salt are the most common (AGROFIT, 2022). Some researchers found no significant differences in weed control between different salts of glyphosate (Richardson et al, 2003;Li et al, 2005;Barroso et al, 2014), while others observed such differences (Molin, Hirase, 2004;Oliveira et al, 2015;Travlos et al, 2017). In general, the largest differences between glyphosate salt formulations are associated with rainfastness following application, incompatibility in tank mixtures, and, especially, speed of action (Barroso et al, 2014;Merotto Jr. et al, 2015;Jakelaitis et al, 2001).…”

Section: Plant Evaluations and Data Analysismentioning

confidence: 99%

“…Given these factors, the differences in the control of E. plana between the salts and application volumes tested may be due to differences in evaporation loss of the herbicide solution or mainly due to variations in the absorption and translocation of the intercepted product. Variations in evaporation were assessed in a study of glyphosate salts isopropylamine, monoammonium, and potassium on the foliar surface of Bidens pilosa L. and Cenchrus echinatus L (Oliveira et al, 2015). The authors indicated that the potassium salt formulation had the longest evaporation time, while the isopropylamine salt evaporated more quickly in both species.…”

Section: Effect Of Application Volumesmentioning

confidence: 99%

Use of a wiper applicator for the control of the invasive species Eragrostis plana with glyphosate salts

Merotto¹,

Gallon²,

Turra³

et al. 2022

Advances in Weed Science

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Background: Eragrostis plana is an invasive plant in native grassland areas associated with degradation of the Pampa biome. Selective control of E. plana is difficult due to its similarity to other grassland species. There is a lack of information about E. plana control using selective herbicide application equipment. Objective: The present study aimed to evaluate the efficacy of a pressurize rope wick applicator for controlling the invasive plant E. plana as function of different salts of glyphosate, application volumes, and year seasons. Methods: The studies were carried out under field conditions and repeated. The first study evaluated glyphosate salts of isopropylamine, dimethylamine, monoammonium, diammonium, and potassium at doses of 720 and 1440 g ha -1 and clethodim at 60 and 120 g ha -1 . The second study assessed application volumes of 8, 24, 40, and 56 L ha -1 using isopropylamine and potassium salts of glyphosate. Results: Glyphosate applied in summer was more effective at controlling E. plana, with less regrowth than glyphosate application in winter. The glyphosate diammonium was more effective at controlling E. plana than isopropylamine, dimethylamine, monoammonium, or potassium salt formulations at 1440 g ha -1 . Application volume of glyphosate between 8 and 40 L ha -1 provided similar control of E. plana and pasture selectivity. Conclusions: Glyphosate applied with a rope wick selective applicator was effective in controlling E. plana clumps and was selective to grassland. The control efficacy varied as a function of glyphosate salts and year season, but not due to application volume of 8 and 40 L ha -1 .

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“…In recent research, Oliveira et al assessed the influence of glyphosate formulations on the wetted area and evaporation time of glyphosate droplets on different surfaces target weeds [43]. Tests were conducted with droplets 500 µm in diameter, containing three formulations of glyphosate (isopropylamine salt, ammonium salt and potassium salt), which were deposited on three surfaces, two leaves (Bidens pilosa L. and Cenchrus echinatus L.) and one glass slide.…”

Section: Effect Of Salt Formulation On Glyphosate Efficacymentioning

confidence: 99%

Glyphosate Efficacy of Different Salt Formulations and Adjuvant Additives on Various Weeds

2017

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In many crops, weeds are managed by herbicides, mainly due to the decrease in crop yields and farmers' incomes caused by them. In general, chemical control of weeds is considered to be an easy, relatively cheap, and highly effective method. However, not all weeds can be successfully controlled, either because of their natural tolerance or their herbicide resistance. Glyphosate is one of the most widely used herbicides in the world. It can manage effectively a broad spectrum of weeds, and promotes conservation agriculture by significantly reducing conventional plough tillage. Unfortunately, its extensive use has led to the evolution of glyphosate resistance, which has evolved into a major problem for global crop production. Alternative herbicides are, in some cases, available, but they do not usually control certain weeds as efficiently as glyphosate. The transmission of herbicides to the target site is a complex process, and consists of several stages. Each herbicide is affected and can be manipulated by the product formulation for the optimization of its use. Many experiments have confirmed that different glyphosate salts and adjuvant additives are instrumental in the optimization of herbicide absorption and delivery processes. The objective of this paper is to provide a brief overview of these experiments and summarize the literature related to the effect of various glyphosate formulations and adjuvants on weed control. Determining the differences among formulations and adjuvants may lead to the further optimized long-term use of glyphosate.

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Influence of the Glyphosate Formulations on Wettability and Evaporation Time of Droplets on Different Targets

Cited by 7 publications

References 15 publications

Ammonium sulfate improves the efficacy of glyphosate on South African lovegrass (Eragrostis plana) under water stress

Ammonium sulfate improves the efficacy of glyphosate on South African lovegrass (Eragrostis plana) under water stress

Use of a wiper applicator for the control of the invasive species Eragrostis plana with glyphosate salts

Glyphosate Efficacy of Different Salt Formulations and Adjuvant Additives on Various Weeds

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