Efeito hormótico de gliphosate no desenvolvimento inicial de cana-de-açúcar

Silva, Marcelo de Almeida; Aragão, Natália Carolina; Barbosa, Mariana de Almeida; Jerônimo, Elisangela Marques; Carlin, Samira Domingues

doi:10.1590/s0006-87052009000400017

Cited by 37 publications

(37 citation statements)

References 10 publications

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“…(Halter 2009). O glyphosate apresentou efeito de hormese em diversas plantas, como crescimento da parte aérea e radicular de C. bengalensis ), aumento de matéria verde em milho (Wagner et al 2003), crescimento inicial em cana-de-açúcar (Silva et al 2009) e teor de fósforo nas folhas de eucalipto ).…”

Section: Hormesis Effect Of Glyphosate On Common Bean Cultivarsunclassified

Efeito hormese de glyphosate em feijoeiro

Silva

Arf

Gerlach

et al. 2012

Pesqui. Agropecu. Trop.

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Embora o efeito hormese seja amplamente conhecido, ainda não tem aplicação prática definida para o desenvolvimento da tecnologia agropecuária. Desta forma, propôs-se um estudo, no município de Selvíria (MS), com o objetivo de verificar o efeito da aplicação de baixas doses do herbicida glyphosate (0 g ha-1, 10 g ha-1, 20 g ha-1, 30 g ha-1 e 40 g ha-1 do ingrediente ativo) no desenvolvimento e produtividade de cultivares de feijão (Carioca precoce - tipo I, Juriti - tipo II e Pérola - tipo III) irrigadas por aspersão, no outono-inverno de 2009 e 2010. O delineamento experimental foi em blocos casualizados, com 15 tratamentos dispostos em esquema fatorial 5x3 e quatro repetições. Concluiu-se que a massa de 100 grãos foi reduzida, quando submetida a subdoses mais elevadas de glyphosate, e que a aplicação de subdoses de glyphosate não alterou a produtividade do feijoeiro, quando avaliadas as três cultivares conjuntamente, entretanto, quando cada cultivar foi analisada individualmente, verificou-se aumento na produtividade do feijoeiro de até 10%, para a cultivar Juriti.

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Section: Hormesis Effect Of Glyphosate On Common Bean Cultivarsunclassified

Efeito hormese de glyphosate em feijoeiro

Silva

Arf

Gerlach

et al. 2012

Pesqui. Agropecu. Trop.

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“…In addition, herbicide sub doses may positively influence height growth and mass accumulation of plant dry mass, and they may turn this variable into a not very precise one (Silva et al, 2009). …”

Section: (A) (B) (C)mentioning

confidence: 99%

Ametryn Leaching in Soils from the Sugarcane Region in Northeastern Brazilian

et al. 2016

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-Ametryn is one of the most widely used herbicides in the sugarcane culture. Little is known about the interactions between this herbicide and the attributes of soils in the sugarcane region of northeastern Brazil. This knowledge, before recommending herbicide, will minimize the negative effects on the environment, particularly on water resources, and will ensure weed control efficacy. In this work, ametryn leaching potential was estimated through bioassays and chromatography, in five soils from the sugarcane region in northeastern Brazil: Quartzarenic Neosol (Entisol); Red Argisol (Ultisol); Ferrihumiluvic Spodosol (Spodosols); Red-Yellow Acrisol (Oxisol) and Haplic Cambisol (Inceptisols). To achieve this, columns were prepared with samples of the respective soils. On top of these columns ametryn was applied and, 12 hours later, a 60 mm rainfall was simulated. After water draining (72 hours after herbicide application), the columns were longitudinally opened to withdraw samples of each soil, every 5 cm. On some of these samples, ametryn quantification was performed by high-performance liquid chromatography and, on the others, biological assays were performed to confirm the results. Ametryn mobility was influenced by the physical-chemical characteristics of soils, mainly by organic matter content, texture and cation exchange capacity (CEC). However, this cannot be considered for Ferrihumiluvic Spodosol, whose cementing characteristics restrict the infiltration of water and organic compounds. Increased leaching ametryn occurred in Quartzarenic Neosol (Entisol), with higher herbicide concentration in the 5 to 10 cm depth layer, in relation to the 0 to 5 cm surface layer, indicating possible agronomic efficiency loss and higher risk of groundwater contamination.Keywords: herbicide, liquid chromatography, bioassay, mobility. RESUMO -O ametryn é um dos herbicidas mais utilizados na cultura da cana-de-açúcar, e pouco se conhece sobre as interações desse herbicida com os atributos dos solos da região canavieira do Nordeste brasileiro. Esse conhecimento antes da recomendação do herbicida permite minimizar os efeitos negativos ao ambiente -em especial, aos recursos hídricos -e garantir a eficiência no

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“…Some herbicides used in sub-doses may exert an inverse function and assist in plant development (Cedergreen et al, 2007;Silva et al, 2009). In larger doses, there was a stimulatory effect of the auxin herbicide.…”

Section: Residual Action Of 24-d + Picloram In a Soil Cultivated Witmentioning

confidence: 99%

Resposta fisiológica de espécies de eucalipto cultivadas em solo tratado com herbicidas mimetizadores de auxinas

et al. 2014

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-The objective was the assessment of the persistence and risk of intoxication of eucalyptus species by mixing picloram 2,4-D herbicide on application prior to forest planting. The experiment was deployed in the field in a completely randomized design with 6 repetitions, in a 4 x 5 factorial scheme, with four species (Eucalyptus urophylla, E. globulus, E. saligna and Corimbia citriodora) and five doses of the picloram base herbicide + 2,4-D (64 + 240 g L -1 ): 0, 3, 4, 5, and 6 L ha -1 of the product, applied 30 days before deployment of culture. At 15 and 40 days after planting (DAP), physiological assessments were carried out. At 90 days after herbicide application (DAA) a bioassay took place to identify the residual effect of the product. No species showed visible symptoms of intoxication; however, there were physiological changes. For photosynthetic rate there were different responses, with reduction for larger doses, except in E. saligna. At 15 DAP, E. saligna and E. urophylla showed higher rates for stomatal conductance and transpiration. At 40 DAP, it was found that increasing the doses caused a linear decrease in stomatal conductance. Water use efficiency of plants was lower at 15 DAP in higher doses, with no changes at 40 DAP. Toxic symptoms were not noticed the in bioindicator at 90 DAA. However, increasing the applied doses caused a positive linear effect on the accumulation of biomass of the bioindicator. The mixture of picloram + 2,4-D did not cause morphological changes, but triggered negative physiological responses in the plants.Keywords: Eucalyptus, picloram, 2,4-D, photosynthetic rate, water use efficiency, bioassay. RESUMO -Objetivou-se neste trabalho avaliar a persistência e o risco de intoxicação de espécies de eucalipto para mistura de herbicidas picloram + 2,4-D em aplicação prévia ao plantio florestal. O experimento foi implantado em campo, em delineamento inteiramente casualizado com 6 repetições, no esquema fatorial 4 x 5, com quatro espécies (Eucalyptus urophylla, E. globulus, E. saligna e Corimbia citriodora) e cinco doses de herbicida à base de picloram + 2,4-D (64 + 240 g L -

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Efeito hormótico de gliphosate no desenvolvimento inicial de cana-de-açúcar

Cited by 37 publications

References 10 publications

Efeito hormese de glyphosate em feijoeiro

Efeito hormese de glyphosate em feijoeiro

Ametryn Leaching in Soils from the Sugarcane Region in Northeastern Brazilian

Resposta fisiológica de espécies de eucalipto cultivadas em solo tratado com herbicidas mimetizadores de auxinas

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