Adjuvants plus phytosanitary products and the effects on the physical-chemical properties of the spray liquids

Assunção, Heli Heros Teodoro de; Campos, Saulo Felipe Brockes; Sousa, Luciana Alves de; Lemes, Ernane Miranda; Zandonadi, César Henrique Souza; Cunha, João Paulo Arantes Rodrigues da

doi:10.14393/bj-v35n6a2019-46994

Cited by 7 publications

(6 citation statements)

References 10 publications

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“…Results confirmed that density and viscosity of solutions containing NIS, NIS-DRA, and NIS-surfactant were greater than herbicide alone, independently of the presence of water conditioner. Similar results were found by Assuncao et al (2019) [47] in which glyphosate solution containing a synthetic adjuvant presented density 2.2% higher than glyphosate alone. Furthermore, Moraes et al (2019) [36] demonstrated that lactofen containing COC (crop oil concentrate), NIS, MSO (methylated soybean oil) and COC-DRA increased viscosity by 4.3%, 2.6%, 3.6%, and 5.7%, respectively, compared to lactofen alone.…”

Section: Discussionsupporting

confidence: 84%

Physical–Chemical Properties, Droplet Size, and Efficacy of Dicamba Plus Glyphosate Tank Mixture Influenced by Adjuvants

et al. 2021

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Dicamba plus glyphosate tank mixture have been largely adopted for postemergence weed control after the development of dicamba-tolerant crops. Ammonium sulfate is commonly used as water conditioner (WC) to increase glyphosate efficacy, but its use is restricted for dicamba herbicides. The use of non-AMS water conditioner and other adjuvants could be a way to optimize efficacy of this tank mixture while mitigating herbicide off-target movement. The objective of this study was to determine the physical–chemical properties and droplet size distribution of dicamba and glyphosate solutions with and without non-AMS WC alone and tank mixed with other adjuvants and evaluate the response of weed species to these solutions under greenhouse and field conditions. The adjuvants mostly increased density and viscosity and decreased contact angle and surface tension of herbicide solutions. In presence of WC, except for the adjuvants containing drift reducing agent, Dv0.5 decreased with the addition of adjuvants. Under greenhouse conditions, biomass reduction increased up to 47 and 33 percentage points for velvetleaf and c. waterhemp when adjuvants were added to solutions without WC, respectively. No increase in control of horseweed and Palmer amaranth was observed with the use of adjuvants under field conditions.

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Section: Discussionsupporting

confidence: 84%

Physical–Chemical Properties, Droplet Size, and Efficacy of Dicamba Plus Glyphosate Tank Mixture Influenced by Adjuvants

et al. 2021

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“…The electrical conductivity of the spray solutions was determined according to the methodology used by Assunção et al (2019a), and measured directly in the solutions using a portable conductivity meter (AKSO, AK59, São Leopoldo, Rio Grande do Sul, Brazil). Before the readings were taken, the equipment was calibrated using standard solutions provided by the device manufacturer.…”

Section: Test 1 -Determination Of the Electrical Conductivity Of The mentioning

confidence: 99%

Spray Deposition on Maize Using an Electrostatic Sprayer

et al. 2020

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It is a well-known fact that the application of pesticides can be improved using an electrostatic spray due to the reduction of the application rate and increase in deposition on plant targets. However, little information exists on the use of such technology in maize crops. Thus, this study is aimed to evaluate the spray deposition on maize resulting from spray application using an electrostatic sprayer in combination with low application rates and different spray compositions. A field experiment was conducted in a randomized block having a 2×2×2 factorial design with two application rates (95 and 52 L ha-1), with or without the spray electrification, and with or without the synthetic adjuvant. The droplet electrification ability, interference of the electrical conductivity of the spray solution, losses of spray solution to the soil, and spray deposition on maize plants were evaluated for two cases of insecticide applications. The Faraday cage method was used to determine the spray electrification ability of the equipment. The spray deposition on plants and the losses to the soil were analyzed using a tracer (food coloring dye) added to the spray solution that was subsequently detected by spectrophotometry. It was seen that the electrostatic sprayer improved the spray application efficiency, which responded positively to the increase in the electrical conductivity of the spray solution. The deposition of the electrified spray solution on the upper third canopy of maize was found to be higher; the spray solution electrification also reduced the losses to the soil, regardless of the application rate.

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“…Assuncao et al. (2019) reported that the addition of a synthetic adjuvant to glyphosate solution increased viscosity by 4.1% when compared to glyphosate alone. However, the addition of EA2 and EA4 to F2 solutions reduced the viscosity, which can be explained by the different NIS composition present in those formulations in relation to EA1 and EA3.…”

Section: Resultsmentioning

confidence: 99%

Influence of surfactant‐humectant adjuvants on physical properties, droplet size, and efficacy of glufosinate formulations

Polli

Alves

Moraes

et al. 2022

Agrosystems Geosci & Env

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Glufosinate efficacy is inconsistent among weed species and under environmental conditions that favor rapid droplet drying. Surfactant‐humectant adjuvants could maximize glufosinate efficacy by increasing wetting and penetration into the leaf surface while decreasing evaporation rate (ER). However, there is a lack of information in the literature about the interaction of surfactant‐humectants adjuvants with glufosinate. The objective of this study was to investigate the influence of surfactant‐humectant adjuvants on the physical properties, droplet size, and efficacy of two glufosinate formulations. Laboratory, greenhouse, and field studies were conducted at the Pesticide Application Technology Laboratory of the University of Nebraska‐Lincoln. Treatment design was a 2 × 5 factorial with two glufosinate formulations combined with five adjuvant treatments plus an untreated control. Density and viscosity of glufosinate solutions mostly increased with the addition of adjuvants. However, the influence of the adjuvants on dynamic surface tension (dST), static contact angle (sCA), and evaporation rate (ER) varied by glufosinate formulation, adjuvant, and relative humidity (RH). Under greenhouse conditions, an improvement in efficacy by adding adjuvants was mainly observed for Interline solutions. The addition of adjuvants to Interline solutions increased biomass reduction up to 19 and 35% for common lambsquarters (Chenopodium album L.) and kochia [Bassia scoparia (L.) A. J. Scott], respectively. Also, some of the adjuvants presented null or antagonistic influence on herbicide efficacy. No increase in control, biomass reduction, and mortality of horseweed (Erigeron canadensis L.) and Palmer amaranth (Amaranthus palmeri S. Watson) was observed with the use of adjuvants under field conditions. Herbicide‐adjuvant‐plant‐environment interaction is complex. Thus, the use of surfactant‐humectant adjuvants may not increase herbicide efficacy.

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Adjuvants plus phytosanitary products and the effects on the physical-chemical properties of the spray liquids

Cited by 7 publications

References 10 publications

Physical–Chemical Properties, Droplet Size, and Efficacy of Dicamba Plus Glyphosate Tank Mixture Influenced by Adjuvants

Physical–Chemical Properties, Droplet Size, and Efficacy of Dicamba Plus Glyphosate Tank Mixture Influenced by Adjuvants

Spray Deposition on Maize Using an Electrostatic Sprayer

Influence of surfactant‐humectant adjuvants on physical properties, droplet size, and efficacy of glufosinate formulations

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