Avaliação do glyphosate e paraquat no manejo da Brachiaria ruziziensis

Costa, Nivan B. da; Peres, Eduardo Jorge de Lima; Ritter, Lucas; Silva, Pabluo Volpato; Fey, Emerson

doi:10.7824/rbh.v12i1.179

Cited by 11 publications

(14 citation statements)

References 9 publications

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“…These results do not comply with the ones found by Costa et al (2013), who evaluated glyphosate efficacy in B. ruziziensis management and obtained plant control with glyphosate doses over 720 g ha ) in the combination of soy bean and B. brizantha, and the results allowed concluding that fluazifop-pbutyl reduces the initial growth of the fodder plant, being able to lead to plant death due to the shadowing imposed by soy bean culture. Dan et al (2011) evaluated the initial suppression imposed by mesotrione (192 g ha -1 ) to B. brizantha in the agriculture/cattle integrated system.…”

Section: Phytotechnical Datacontrasting

confidence: 67%

Herbicide Selectivity to Signal Grass and Congo Grass

et al. 2017

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-This study was conducted in order to evaluate the selectivity of signal grass and congo grass, submitted to post-emergence herbicide application. The experiment was conducted under greenhouse conditions, in Diamantina, Minas Gerais state, and it was arranged in a randomized block design, with five replications. Treatments were set in factor scheme (8 x 2) + 2. Eight herbicides (nicosulfuron; clomazone; glyphosate; fluazifop-p-butyl + fomesafen; lactofen; fomesafen; fluazifop-p-butyl and mesotrione) were applied in doses recommended by the manufacturer on two fodder species: Brachiaria decumbens cv. Basilisk (signal grass) and Brachiaria ruziziensis (congo grass); in addition, there were two control samples without herbicide application, for a total of 18 treatments. The evaluated herbicides showed less intoxication on signal grass when compared to congo grass. Nicosulfuron and glyphosate promoted higher intoxication on both species when compared to the other herbicides. Glyphosate, fluazifop-p-butyl + fomesafen, fluazifop-p-butyl, mesotrione and nicosulfuron affected the ratio variable / maximum fluorescence (Fv/Fm) in both species, indicating an effect provided by these herbicides on the electron transport chain. Results demonstrated that signal grass and congo grass have higher susceptibility to glyphosate, fluazifop-p-butyl + fomesafen, fluazifop-p-butyl, mesotrione and nicosulfuron. congo grass shows higher susceptibility to the studied herbicides when compared to signal grass. Keywords

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Section: Phytotechnical Datacontrasting

confidence: 67%

Herbicide Selectivity to Signal Grass and Congo Grass

et al. 2017

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“…Após a colheita da soja, muitos produtores do Estado reutilizam o solo para o plantio de capim com finalidade de engorda do gado. A adoção de espécies do gênero Brachiaria vem sendo recomendada como planta de cobertura pela excelente adaptação a solos de baixa fertilidade, fácil estabelecimento e considerável produção de biomassa durante o ano, proporcionando excelente cobertura vegetal do solo (Timossi et al, 2007;Machado e Assis, 2010;Adegas et al, 2011;Costa et al, 2013;Albuquerque et al, 2017). Medeiros et al (2009) citam que uma das dificuldades de se utilizar o sistema de plantio direto em Roraima é o reduzido conhecimento de espécies de plantas para a cobertura do solo após a colheita das culturas comerciais, devido ao longo período de déficit hídrico anual.…”

Section: Introductionunclassified

Manejo químico de Urochloa ruziziensis consorciado com soja na savana de Roraima

Rodrigues¹,

Medeiros

Albuquerque

et al. 2018

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Manejo químico de Urochloa ruziziensis consorciado com soja na savana de RoraimaChemical management of Urochloa ruziziensis intercropping in soybean crop in savanah of Roraima Resumo -O objetivo do estudo foi avaliar o manejo químico de Urochloa ruziziensis consorciado com soja em sistema de plantio direto na savana de Roraima. O experimento foi conduzido em campo, em área experimental localizada no município de Boa Vista -RR, no ano de 2015. Os tratamentos consistiram da combinação de quatro doses do herbicida glyphosate (720; 1.200; 1.680 e 2.160 g ha -1 de i.a) pulverizado antes da semeadura da soja como dessecante e cinco doses do herbicida fenoxaprop -p-ethyl (0; 38,5; 77; 115,5 e 154 g ha -1 de i.a.) pulverizado 32 dias após a emergência da cultura em pós-emergência. O delineamento experimental foi o de blocos completos casualizados no esquema de parcelas subdivididas, com quatro repetições. Para a cultura da soja foram avaliados a altura de plantas, altura de inserção da 1 a vagem, número de vagens por planta, número de grãos por vagem, massa de 100 grãos e produtividade de grãos em kg ha -1 . Para a U. ruziziensis foram avaliadas a massa de forragem fresca e seca aos 70 dias após a colheita da soja e expressa em kg ha -1 . Conclui-se que, para as condições do cerrado de Roraima, apenas a aplicação do glyphosate na dose de 1.387,64 g ha -1 , aplicado em pós-emergência na cultura da soja, garante máxima produtividade de grãos (3.660,07 kg ha -1 ) e de massa fresca (10.136,22 kg ha -1 ) e seca (2.404,63 kg ha -1 ) de U. ruziziensis para formação de cobertura do solo para o próximo plantio, necessário para garantir a sustentabilidade do sistema produtivo. Palavras-chave: cobertura vegetal, componentes de produção, dessecação, forrageiras Abstract -The objective of the study was to evaluate the chemical management of Urochloa ruziziensis intercropped with soybean under no tillage system in the Roraima savanna. The experiment was conducted in an experimental area located in the municipality of Boa Vista -RR, in the year 2015. The treatments consisted of the combination of four doses of the herbicide glyphosate (720; 1.200; 1.680 and 2.160 g ha -1 of i.a) sprayed prior to sowing the soybean as a desiccant and five doses of the herbicide fenoxaprop-p-ethyl (0; 38.5; 77; 115.5 and 154 g ha -1 of i.a) sprayed 32 days after emergence of the post-emergence crop. The experimental design was a randomized complete block in the subdivided plots scheme, with four replications. For the soybean crop were evaluated the height of plants, height of insertion of the first pod, number of pods per plant, number of grains per pod, mass of Rodrigues et al. Rev. Bras. Herb., v.17, n.2, e581, abr./jun. 2018 2/11

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“…Perennial forage plants are controlled with the use of systemic herbicides (Costa et al, 2013), such as glyphosate and sulfosate; the herbicide dose and the time required for control are variable among forage species and weeds (Carvalho et al, 2011;Silva et al, 2013, Ceccon andConcenço, 2014). The desiccation interval, which is the period between herbicide application and sowing of the new crop, ranges from 7 to 21 days, and the glyphosate dose ranges from 0.72 to 1.44 kg a.e.…”

Section: Introductionmentioning

confidence: 99%

“…The desiccation interval, which is the period between herbicide application and sowing of the new crop, ranges from 7 to 21 days, and the glyphosate dose ranges from 0.72 to 1.44 kg a.e. ha -1 (Jakelaitis et al, 2005;Nunes et al, 2009;Costa et al, 2013;Nepomuceno et al, 2012). Susceptibility to glyphosate may be inter-and intraspecies (Brighenti et al, 2011;Machado and Valle, 2011).…”

Section: Introductionmentioning

confidence: 99%

Susceptibility of Perennial Tropical Forage Plants to Glyphosate Herbicide in Integrated Crop-Livestock Farming Systems

et al. 2018

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The purpose of this study was to evaluate forage plant susceptibility in Urochloa ssp. and Megathyrsus maximus with two glyphosate herbicide doses, to increase the efficiency of integrated crop-livestock farming systems. A randomized block design was adopted, in a split-plot arrangement, with six replications. In the main plots, the following treatments were established: Urochloa ruziziensis, U. decumbens, U. brizantha cvs. Xaraés, BRS Piatã and BRS Paiaguás, Megathyrsus maximus cvs. Aruana and BRS Tamani; in the subplots, there were doses of glyphosate herbicide; 0.72 and 1.44 kg a.e. ha-1. The estimated control percentage was consisted of a grading scale from zero (fully living tiller) to 100 (fully dead tillers), assigned 7; 14; 21 and 28 days after herbicide application. The 0.72 kg a.e. ha-1 glyphosate dose was not effective for forage control, but it was possible to identify the most susceptible genotypes, such as U. ruziziensis and BRS Paiaguás. The 1.44 kg a.e. ha-1 dose was satisfactory in controlling (³80%) the grasses U. ruziziensis, U. brizantha cv. BRS Paiaguás and M. maximum cv. Aruana at 17, 18 and 18 days of desiccation intervals, respectively. In conclusion, the susceptibility of forage plants to herbicide glyphosate varies among species and cultivars. U. ruziziensis, BRS Paiaguás and Aruana grasses are desiccated with reduced herbicide doses and short desiccation intervals, and can contribute to the diversification of the forage used in integrated crop-livestock farming systems.

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Avaliação do glyphosate e paraquat no manejo da Brachiaria ruziziensis

Cited by 11 publications

References 9 publications

Herbicide Selectivity to Signal Grass and Congo Grass

Herbicide Selectivity to Signal Grass and Congo Grass

Manejo químico de Urochloa ruziziensis consorciado com soja na savana de Roraima

Susceptibility of Perennial Tropical Forage Plants to Glyphosate Herbicide in Integrated Crop-Livestock Farming Systems

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