Tipos de colheita e épocas de aplicação de glifosato na erradicação de soqueiras de cana-de-açúcar

Silva, Marcelo de Almeida; Carlin, Samira Domingues; Caputo, Marina Maitto

doi:10.1590/s0100-204x2006000100007

Cited by 13 publications

(11 citation statements)

References 10 publications

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“…ha -1 (NETTO, 2006) e também na eliminação de soqueiras para fins de renovação da cultura, com doses de 1800 a 2160 g e.a. ha -1 (SILVA et al, 2006). O objetivo deste estudo foi avaliar a resposta de plantas de cana-de-açúcar em estágio inicial de desenvolvimento à aplicação de subdoses do herbicida gliphosate.…”

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

Silva¹,

Aragão

Barbosa

et al. 2009

Bragantia

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RESUMOEfeito hormótico é definido como o efeito estimulante de pequenas doses de substâncias, as quais em doses maiores são inibitórias. Esta pesquisa objetivou verificar, em casa-de-vegetação, o efeito de subdoses do herbicida gliphosate no desenvolvimento inicial de cana-de-açúcar. Plantas de cana-de-açúcar foram obtidas de gemas isoladas plantadas em vasos plásticos de 2,5 L. Aos 50 dias após o plantio, gliphosate foi aplicado nas doses de 0; 1,8; 3,6; 7,2; 18; 36; 72; 180; 360 e 720 g e.a. ha -1 . Aos 0 e 25 dias após a aplicação (DAA) foram avaliados altura da planta, número de perfilhos, número de folhas verdes, número de folhas secas e estimativa do conteúdo de clorofila (índice SPAD). Aos 25 DAA também foram determinadas a massa fresca e seca da parte aérea e raízes das plantas. O delineamento experimental utilizado foi o inteiramente casualizado com quatro repetições. A dose de 1,8 g e.a. ha -1 de gliphosate estimulou as características de crescimento no desenvolvimento inicial da cana-de-açúcar. Esse efeito hormótico poderá ser utilizado como manejo da cultura para obter melhor exploração do ambiente de produção.Palavras-chave: Saccharum spp., herbicida, subdose, estímulo no crescimento. ABSTRACT HORMETIC EFFECT OF GLYPHOSATE ON THE INITIAL DEVELOPMENT OF SUGARCANEHormesis is defined as the stimulating effect of small doses of substances, which in larger doses are inhibitory. This research aimed at evaluating the effect of low doses of the herbicide glyphosate on the initial development of sugarcane in greenhouse. Sugarcane plants were obtained from isolated buds planted in plastic pots of 2.5 L. At 50 days after planting, glyphosate was sprayed at 0, 1. 8, 3.6, 7.2, 18, 36, 72, 180, . At 0 and 25 days after application (daa), plant height, tiller number, number of green leaves, number of dead leaves and estimated chlorophyll contents (index SPAD) were evaluated. At 25 evaluated daa, fresh and dry mass of above-ground plant and roots were also determined. The experiment was installed in a completely randomized design with four replications. The glyphosate dose of 1.8 g AE ha -1 stimulated growth traits at the initial development of sugarcane. This hormetic effect could be used to manage the crop to exploit better the production environment.

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

Silva¹,

Aragão

Barbosa

et al. 2009

Bragantia

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“…Furthermore, the selectivity of herbicides inhibitors of acetolactate synthase (ALS) in some crops is mainly based on the ability of plants to rapidly metabolize the herbicide into non-toxic forms (SWEESTER et al, 1982). The speed of metabolism can vary depending on species, stage of plant development, and environment (SILVA et al, 2006). Therefore, some of these processes probably occurred in palm plants, despite the fact that they did not present visual signs of damage when subjected to the herbicides studied.…”

Section: Resultsmentioning

confidence: 99%

“…Phytotoxicity was visually assessed at 7, 14, 21, 28, 35, 42, and 49 days after spraying (DAS), using a rating scale from SBCPD (1995), where '0' corresponds to no injury observed in the plants and '100' corresponds to plant death. The following were also evaluated: plant height (from the base to the apex of the top leaf, completely unfurled), the number of fully unfurled leaves, and the dry mass of shoots at the end of each study.…”

Section: Methodsmentioning

confidence: 99%

Herbicide selectivity in the early development of Alexander palm and peach palm

Queiroz

Silva

Pereira

et al. 2016

SCA

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Herbicides are an efficient weed-control method, and herbicide selectivity with regard to palm species is an important subject of agricultural research. Owing to a lack of studies in the literature regarding the use of herbicides on palm trees, especially during the early stages of growth, the present study aimed to evaluate the selectivity of some herbicides during the early development of Alexander palm (Archontophoenix alexandrae) and peach palm (Bactris gasipaes) seedlings. The study was conducted in two seasons in a completely randomized design with eight treatments and four repetitions. The herbicide treatments and dosages (g i.a. ha , and a no-herbicide control was included. The seedlings of both types of trees were transplanted into 3.1-L plastic containers. In the first study, herbicide was applied to Alexander palm seedlings of 25-30 cm in height. In the second study, herbicide was applied to Alexander palm seedlings of 30-40 cm in height. Herbicide was applied to peach palm tree seedlings of 40-55 cm in height in both studies. In peach palms only, the herbicides caused slight visible damage during early development. Collectively, the results suggested that all herbicides used are selective and can be used on peach palms during the various stages of development when there are one to four leaves. For Alexander palms, fluazifop-p-butyl, quizalofop-p-ethyl, and lactofen were the only herbicides that did not affect early development during the stages when the plant had one to four leaves.

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“…The gradual onset of the effects of glyphosate on plants by reducing the referred content was also observed by Meschede et al (2011). According to Siqueira et al (1999), this occurs because glyphosate inhibits the synthesis of ä-aminolevulinate acid, a precursor of chlorophyll, which is associated with the efficiency of the photosynthesis process according to Lopes et al (2009). As a result, the least interference in the process affects plant development.…”

Section: Resultsmentioning

confidence: 99%

“…According to Silva et al (2006), glyphosate is the most widely used herbicide in the chemical eradication of ratoons. This product inhibits the enzyme 5-enolpyruvyl-shikimate-3-phosphate synthase (EPSPS), a precursor of aromatic amino acids phenylalanine, tyrosine and tryptophan, essential for protein synthesis (Kruse et al;2000).…”

Section: Introductionmentioning

confidence: 99%

Tolerance of sugarcane cultivars to chemical eradication

Adriano

Azania²,

Pinto³

et al. 2013

Planta daninha

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Knowledge of the minimum rate of glyphosate required to eradicate sugarcane ratoons can reduce the amount of herbicide used. To confirm this hypothesis, this study aimed to investigate the tolerance of different sugarcane cultivars to chemical eradication, at different glyphosate rates. The experiment was conducted in a randomized block design in a split-plot scheme, with four replications. The sugarcane cultivars (IACSP94-2094, IACSP94-2101, IACSP93-3046, IACSP94‑4004, IAC86-2480, and RB72454) were allocated in plots and the glyphosate rates (0, 1,440, 2,160, 2,880, 3,600, and 4,320 g ha-1), in the sub plots. The traits evaluated were signs of poisoning symptoms; total chlorophyll content, plant height, percentage of dead tillers, and dry weight of the plants. At 45 days after application (DAA), the glyphosate rate of 1,440 g a.e. ha-1 eradicated the cultivars IACSP94-2094 and IACSP94-2101, as well as RB72454 with application of 2,160 g a.e. ha‑1. Application of glyphosate 2,880 g a.e. ha-1 eradicated both IACSP93-3046 and IAC86-2480 and glyphosate 3,600 g a.e. ha-1 eradicated IACSP94-4004. The most tolerant cultivar was IACSP94‑4004, eradicated at the rate of 3,600 g. a.e. ha-1. This confirms the hypothesis that knowing the cultivar's tolerance leads, in practice, to a smaller amount of herbicide applied to the environment, which also reduces production costs.

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Tipos de colheita e épocas de aplicação de glifosato na erradicação de soqueiras de cana-de-açúcar

Cited by 13 publications

References 10 publications

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

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

Herbicide selectivity in the early development of Alexander palm and peach palm

Tolerance of sugarcane cultivars to chemical eradication

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