Manejo químico de Eichhornia crassipes e Brachiaria subquadripara com Diquat em condições de reservatório

Martins, D.; Velini, Edivaldo Domingues; Costa, N.V.; Cardoso, L.A.; Souza, Gustavo Soares de

doi:10.1590/s0100-83582011000100006

Cited by 4 publications

(1 citation statement)

References 12 publications

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“…The diquat herbicide has been studied as to the efficacy in aquatic plants and, because it has low translocation in plants, it is commonly applied with high spray volumes, associated to different droplets classes (Pitelli et al, 2008(Pitelli et al, , 2011Martins et al, 2011). However, there is demand for the reduction of costs, and one of the alternatives is to increase the operational efficiency of the pesticides spray through new techniques, such as the use of reduced volumes associated to the spectrum of droplets with a smaller potential of loss through drifting.…”

Section: Introductionmentioning

confidence: 99%

Application Volumes and Sizes of Droplets for the Application of Diquat Herbicide in the Control of Eichhornia crassipes

et al. 2016

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The objective of this study was to evaluate the efficiency of application and the efficacy of control of water hyacinth (Eichhornia crassipes) with the use of the diquat herbicide done with two application volumes associated to three droplets classes. Three experiments were conducted; in the first, the application efficiency was evaluated; in the second, the control efficiency and; in the third, the droplet spectrum. They were conducted in a completely randomized design with five, four and six replicates, respectively. The treatments were arranged in a 2 x 3 factorial design, with two application volumes (100 and 200 L ha-1) and three droplets classes (fine, extremely coarse and ultra-coarse) to the first and second experiment and the third comprised two diquat concentrations in spray solution (2 and 4 g i.a. L-1) and three droplets classes (fine, extremely coarse and ultra-coarse). The application efficiency was determined by the coverage by droplets, spray deposition and active ingredient of the herbicide (diquat). The efficacy was measured by the control and the percentage of plants with regrowth at 50 days after application. The spectrum of droplets produced per each nozzle model used to obtain the droplets classes were analyzed. According to the parameters analyzed, using the droplets classes extremely thick and ultra thick can provide greater certainty in the application of diquat in the aquatic environment associated with the deposition of the active and sufficient coverage to control Eichhornia crassipes with both application volumes

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Section: Introductionmentioning

confidence: 99%

Application Volumes and Sizes of Droplets for the Application of Diquat Herbicide in the Control of Eichhornia crassipes

et al. 2016

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Thermochemical conversion of aquatic weed biomass in a rotary kiln reactor for production of bio-based derivatives

Carregosa

Silva

et al. 2023

Journal of Analytical and Applied Pyrolysis

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Half-Life of Glyphosate on the Control of Water Hyacinths in Water Tanks

Souza¹,

Foloni²,

Filho³

et al. 2017

JWARP

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The present study had the purpose to assess the behavior of the herbicide glyphosate in the control of water hyacinths, in a water environment through half-life, in a controlled and closed experimental field, in order to contribute to the analysis of the risk of the environmental impact of the use of this product. Eight fiber-cement tanks with the storage capacity of 250 liters were used under the conditions without water flow and without replacement of water. The experiment was designed in two treatments with four repetitions, the first being colonized by water hyacinths and the second without the presence of the macrophyte. The recommended dose, according to the manufacturer, was 7.0 L•ha −1 or 3402 g•ha −1 of equivalent acid. For the application in the tanks, we have used carbon dioxide (CO 2 ) precision equipment, providing a flow rate of 200 L•ha −1 . The samples were collected on the day of the application (day zero) and 2, 4, 8, 16, 32 and 64 days thereafter (DAP). The method used for determination of residues was by high performance liquid chromatography (HPLC) and mass spectrometry with a mass selective detector. From the mathematical model of charge decay, the half-life of glyphosate in water was estimated to six days for the tanks without water hyacinths and sixteen days for the tanks colonized by macrophytes. The result obtained permits to conclude that the glyphosate in water is quickly degraded in closed water environments and does not leave residues that would prevent its use.

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Manejo químico de Eichhornia crassipes e Brachiaria subquadripara com Diquat em condições de reservatório

Cited by 4 publications

References 12 publications

Application Volumes and Sizes of Droplets for the Application of Diquat Herbicide in the Control of Eichhornia crassipes

Application Volumes and Sizes of Droplets for the Application of Diquat Herbicide in the Control of Eichhornia crassipes

Thermochemical conversion of aquatic weed biomass in a rotary kiln reactor for production of bio-based derivatives

Half-Life of Glyphosate on the Control of Water Hyacinths in Water Tanks

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