Eficácia do glyphosate na dessecação de espécies de Urochloa

Silva, Uadson Ramos da; Timossi, Paulo César; Almeida, Dieimisson Paulo; Lima, Suzete Fernandes

doi:10.7824/rbh.v12i2.221

Cited by 10 publications

(13 citation statements)

References 10 publications

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“…However, when the spray mix volumes were linked to the use of very fine droplets, there was no statistical difference among 200, 150 and 100 L h -1 and, when reducing the application volume to 50 L h -1 , there was a significant reduction in control efficacy. Almeida et al (2013), in a similar study, have also found that droplets size categories influence the control of Urochloa ruziziensis in which very coarse droplets showed similar control efficacy on application volumes of 50, 100, 150 and 200 L h -1 , while with very fine droplets the same was true only for the volume of 200 L ha -1 . 1 Glyphosate at the dose of 0.975 kg ha -1 of acid equivalent + antifoaming at the concentration of 0.0025% of v/v.…”

Section: Resultsmentioning

confidence: 59%

Classes de gotas e volumes de aplicação na dessecação de coberturas vegetais

Almeida¹,

Timossi

Lima

et al. 2015

RBHerbicidas

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-This study has aimed to verify the influence of the droplets size categories and application volumes on burn down Urochloa ruziziensis and Conyza sp. Therefore, two trials were conducted in a randomized block design with four replications in a 2x4 split plot arrangement. The plots consisted in droplets size categories (very fine droplets and ultra coarse droplets) and the subplots consisted in four application volumes (50, 100, 150 and 200 L ha -1 ). For desiccation, glyphosate herbicide was used at 0.975 and 1.3 kg of a.e. ha -1 for controlling plant covers Urochloa ruziziensis and Conyza sp., respectively. Saflufenacil herbicide was used at a dose of 49 g of a.i. ha -1 in association with glyphosate to control Conyza sp. In the application was used a pressurized sprayer by CO2 with spray nozzles model ATR 1.0 and AI 110015. At 5, 10, 15 and 20 days after application (DAA) of the herbicides, visual assessments were done of the control percentage of Urochloa ruziziensis and defoliation in Conyza sp. At 25 DAA, one regrowth percentage assessment of Conyza sp. plant was done. It is concluded that the category of ultra coarse droplets is efficient for desiccation of Urochloa ruziziensis with volumes of up to 50 L ha -1 , while the category of very fine droplets reduces the efficacy with reduced volume application. It was also found that reducing the application volumes increases the possibility of regrowth on burn down Conyza sp.

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Section: Resultsmentioning

confidence: 59%

Classes de gotas e volumes de aplicação na dessecação de coberturas vegetais

Almeida¹,

Timossi

Lima

et al. 2015

RBHerbicidas

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“…Groundcover plant species have different levels of sensitivity to glyphosate (Silva et al, 2013), varying in accordance to species, plant development stage and plant mass quantity (Timossi et al, 2006). These authors verified that U. decumbens and U. brizantha cv.…”

Section: Introductionmentioning

confidence: 70%

“…Biomass levels did not probably interfere in controlling U. ruziziensis (Tables 3 and 4), possibly due to the higher sensitivity to the herbicide compared with the other studied species (Silva et al, 2013;Ceccon and Concenço 2014). Despite the fact, that on 15 and 20 DAA, at the natural biomass level, there was less control of U. decumbens, values are above 80%, which is considered satisfactory (SBCPD, 2000).…”

Section: Resultsmentioning

confidence: 92%

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Eficácia de glyphosate na dessecação de braquiárias em dois níveis de biomassa

et al. 2016

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-The objective of this research was to evaluate the efficacy of glyphosate in desiccating Urochloa ruziziensis, U. decumbens, and U. brizantha cv. Piatã at two levels of biomass for no-till establishment in Cerrado areas. The experimental design was a randomized complete block design with four replications, in a split-plot system. Plots consisted of two levels of biomass and sub-plots consisted of four doses of Roundup Ultra ® -glyphosate at 0.65; 1.30, 1.95 and 2.60 kg ha -1 acid equivalent. The application was performed using custom pressurized CO2 sprayer at the constant pressure of 210 kPa bar equipped with eight nozzles with TT110015, spaced at 0.5 m, and spray solution volume equivalent to 100 liters h -1 . The assessments were based on the percentage of control of plant mass, performed on day 10, 15 and 20 after application. It is possible to conclude that U. ruziziensis is more sensitive to glyphosate than the other studied species and biomass levels influence doses to be given only for U. decumbens and U. brizantha cv. Piatã. Keywords: chemical control; herbicides; vegetation cover; Urochloa sp. Resumo -Objetivou-se com esta pesquisa avaliar a eficácia de glyphosate na dessecação deUrochloa ruziziensis, U. decumbens e U. brizantha cv. Piatã em dois níveis de biomassa para estabelecimento de plantio direto em áreas de Cerrado. O delineamento experimental adotado foi de blocos casualizados, com quatro repetições, em esquema de parcelas subdivididas. As parcelas foram constituídas de dois níveis de biomassa e as subparcelas foram constituídas por quatro dosagens do herbicida glyphosate na marca comercial Roundup Ultra ® a 0,65; 1,30, 1,95 e 2,60 kg ha -1 de equivalente ácido. A aplicação foi realizada com pulverizador customizado pressurizado a CO2 com pressão constante de 210 kPa munido de barra com oito bicos com pontas TT110015, espaçados em 0,5 m e consumo de calda equivalente a 100 L ha -1 . As avaliações basearam-se na porcentagem de controle da massa vegetal, realizada aos 10, 15 e 20 dias após a aplicação. Concluise que a U. ruziziensis é mais sensível ao glyphosate que as demais espécies pesquisadas e que os níveis de biomassa influenciam na dose a ser ministrada apenas para a U. decumbens e U. brizantha cv. Piatã.

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“…Among cover plants, Urochloa ruziziensis has become accepted because it shows high tolerance to water deficit, tillering and soil cover ease (Mateus, 2010), as well as being easily controlled by herbicides adopted during desiccation (Silva et al , 2013). In addition to a good amount of plant cover on the soil and greater facility in controlling weeds, signalgrass helps implanting the crop-livestock integration system, being able to produce enough plant mass to feed animals in the off-season period and residues to establish the no-tillage (Lima et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Weed Management with Urochloa ruziziensis in Three Sowing Methods

et al. 2018

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This research aimed at investigating which sowing method is more suitable for the deployment of Urochloa ruziziensis to suppress the weed community in no-tillage. The design was a randomized block ones, with a 3 x 2 factorial design, in which the first factor was composed of three sowing methods (broadcast, broadcast with incorporation or line sowing) and factor B consisted in the application and non-application of the herbicide 2,4-D. On day 30 and 60 after sowing (DAS), the relative importance of the present plant species was determined. On day 120 and 180 DAS, the accumulation of biomass and the plant cover percentage on the soil provided by the cover crop and weed species were determined. Moreover, on day 180 DAS, the density of the existing weeds was determined. The weed with the highest occurrence in the area was Conyza canadenses, and the lowest percentage of soil covering by signalgrass and the greates occurrence of weeds occurred with broadcast seeding. It is possible to conclude that the broadcast seeding with the incorporation of signalgrass seeds and line sowing methods provide enough plant cover to suppress weed species, avoiding the application of the herbicide 2,4-D in order to suppress the infesting community.

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Eficácia do glyphosate na dessecação de espécies de Urochloa

Cited by 10 publications

References 10 publications

Classes de gotas e volumes de aplicação na dessecação de coberturas vegetais

Classes de gotas e volumes de aplicação na dessecação de coberturas vegetais

Eficácia de glyphosate na dessecação de braquiárias em dois níveis de biomassa

Weed Management with Urochloa ruziziensis in Three Sowing Methods

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