Resposta Diferencial Das Culturas De Milho Rr E Soja Rr À Exposição a Glyphosate E Adubação Fosfatada

Carvalho, Leonardo Bianco de; Pereira, M. de C.; Borges, P.E.V.; Silva, F.J.; Costa, Flávia Regina da

doi:10.1590/s0100-83582015000400013

Cited by 3 publications

(6 citation statements)

References 23 publications

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“…The forage was at the 4-6 tillers stage, intermediate between those proposed by Silveira et al (2017) and Brighenti et al (2011), and the corn was at the six-leaf stage (V6). Applications were made with a CO 2 pressurized sprayer equipped with a bar with a TeeJet 80.02 VS flat nozzle spray, at a constant pressure of 200 kPa, providing an application volume of 200 L ha -1 (Carvalho et al, 2015).…”

Section: Methodsmentioning

confidence: 99%

“…Forage plants at 7, 14, and 21 DAA (days after application) of herbicides were evaluated for the number of tillers by direct counting and plant height (cm) from the soil surface to the end of the last fully expanded leaf. After cutting the plants close to the ground, the dry matter (g) was determined in a forced air circulation oven at 50ºC until reaching constant weight (Carvalho et al, 2015;Silva et al, 2016). The plots consisted of four rows of 4 m length, two corn, and two forage rows, totaling 7.4 m 2 .…”

Section: Physicochemical Characteristics Ph (Caclmentioning

confidence: 99%

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MANAGEMENT OF Urochloa ruziziensis WITH GLYPHOSATE IN INTEGRATED SYSTEM WITH GLYPHOSATE-RESISTANT CORN

Corrêa

Pinto

Freitas

et al. 2019

Rev. Agric. Neotrop.

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This study aimed to evaluate the efficiency of the glyphosate doses in the suppression of Urochloa ruziziensis, to avoid the excessive competition of forage, intercropped with corn in an integrated crop-livestock system. The experiment was conducted in the experimental area of the Escola de Agronomia, of the Universidade Federal de Goiás with glyphosate-resistant corn (Zea mays L.) and Urochloa ruziziensis. The experimental design was randomized blocks with five treatments and four replications in a factorial scheme, with five herbicide doses x three evaluation periods. Treatments were control - non-sprayed, glyphosate herbicide at doses of 72, 144 and 288 g a.e. ha-1, and standard treatment of 8 g a.i. ha-1 of the nicosulfuron herbicide. The sowing was carried out in alternate rows of corn and forage with a spacing of 0.45 m between rows. The treatments were applied with corn at V6 vegetative stage and forage with 4-6 tillers, with evaluations at 7, 14, and 21 days after application. The dose of 72 g a.e. ha-1 of glyphosate, had no efficiency in forage suppression. The dose of 144 g a.e. ha-1 of glyphosate equaled the dose of 8 g a.i. ha-1 of nicosulfuron, which is the standard treatment in this intercropping system. Glyphosate at the dose of 288 g a.e. ha-1 caused the forage's death.

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Section: Methodsmentioning

confidence: 99%

Section: Physicochemical Characteristics Ph (Caclmentioning

confidence: 99%

MANAGEMENT OF Urochloa ruziziensis WITH GLYPHOSATE IN INTEGRATED SYSTEM WITH GLYPHOSATE-RESISTANT CORN

Corrêa

Pinto

Freitas

et al. 2019

Rev. Agric. Neotrop.

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“…Além disso ocorreram reduções lineares do índice SPAD com o aumento da dose de glyphosate (Figura 2c). Com a ionização do glyphosate a um ânion fosfônico, possivelmente ocorreu a imobilização importantes cofatores enzimáticos da biossíntese de clorofila (Zobiole et al, 2010;Khan et al, 2012;Silva et al, 2014), além disso o acúmulo de AMPA, mencionado anteriormente, pode ter contribuído para reduções nos valores da característica (Reddy et al, 2004;Beckie, 2011;Carvalho et al, 2015).…”

Section: /9unclassified

“…Com a inibição da rota do chiquimato ocorrerá redução da síntese de triptofano, este aminoácido é precursor da síntese do AIA que por sua vez promove a síntese de giberelinas, assim os processos de divisão e alongamento celular possivelmente serão inibidos (Carvalho et al, 2015;Taiz et al, 2017). Adicionalmente, o glyphosate pode afetar funções importantes como a síntese de clorofila e proteínas ocasionando redução na fotossíntese líquida (Magalhães et al, 2001;Carvalho et al, 2015).…”

Section: Introductionunclassified

Uso de bioestimulante na reversão de injúria de glyphosate no milho convencional

et al. 2018

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O cultivo de milho convencional vem retomando espaço no panorama agrícola nacional em função da dificuldade de controle do milho tiguera em culturas subsequentes. Entretanto, a deriva de glyphosate em lavouras adjacentes passou a ser uma preocupação entre os produtores e técnicos. Dessa forma o experimento foi instalado para avaliar o efeito de baixas doses de glyphosate na cultura e a capacidade de um bioestimulante a base de hormônios vegetais em reverter as injúrias causadas pelo herbicida, avaliando-se características morfológicas e taxa fotossintética de plantas de milho. Foi utilizado o delineamento inteiramente casualizados com quatro repetições em arranjo fatorial 5 X 2, sendo que o primeiro fator correspondeu a cinco doses de glyphosate (0; 10; 20; 30 e 40 g e.a. ha-1) e o segundo a ausência e presença do bioestimulante. As características avaliadas foram fitointoxicação, diâmetro do colmo, altura plantas e massa fresca de raiz e parte aérea, índice SPAD e taxa fotossintética. A maior dose de glyphosate provocou maior fitointoxicação, além de plantas com menor altura e menor índice SPAD. O bioestimulante proporcionou acréscimos no diâmetro de colmo, índice SPAD e taxa fotossintética. A presença de bioestimulante não proporcionou efeito reparador nos efeitos deletérios provocados pelo glyphosate em plantas de milho convencional.

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“…In various studies into RR2 maize, undesirable effects following glyphosate application, alone or in mixtures, were also detected: these included changes in the nutrient content of the leaves (OSÓRIO et al, 2015), plant height and reduced growth (ALBRECHT et al, 2017). A reduction in grain yield (CORREIA; SANTOS, 2013), visible crop damage (ARAÚJO et al, 2021;SILVA et al, 2020) and reduced biomass accumulation (CARVALHO et al, 2015) were also documented, as have disruptions in nutrient availability in the rhizosphere (JENKINS et al, 2017) and the rhizobacterial community (BARRIUSSO; MELLADO, 2012).…”

Section: Introductionmentioning

confidence: 99%

Effect of glyphosate management, formulations and rates on the agronomic performance of maize with the cp4epsps gene

Albrecht,

Barroso

et al. 2024

RCA

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Second-generation glyphosate-tolerant maize (Roundup Ready 2, RR2) is characterised by the expression of the cp4epsps gene. Despite some studies suggesting possible undesirable eff ects from the application of glyphosate in RR2 maize, other reports have demonstrated glyphosate selectivity for RR2 plants, with minor damage symptoms, if any, and with no negative eff ects on the chlorophyll indices. The aim of this study was to evaluate the eff ect of diff erent types of glyphosate management, formulations and rates of application on chlorophyll indices and the agronomic performance of an RR2 maize genotype expressing the cp4epsps gene. Five experiments were conducted in a full factorial design (2 x 5 x 5) to evaluate two types of management, two formulations and fi ve rates of glyphosate. Damage symptoms, chlorophyll indices and variables related to agronomic performance (plant height, stem diameter, yield and 100-grain weight) were evaluated. Similar crop responses were found for each of the glyphosate formulations (potassium salt and isopropylamine salt) and types of management (single application and sequential application) under test, indicating that the use of glyphosate-based commercial products aff ords fl exibility in terms of formulation and frequency of application. Glyphosate formulated as potassium salt or isopropylamine salt and applied to RR2 maize either in a single application (full rate) or in two sequential applications (each at half rate) has a similar eff ect and may therefore be used without distinction. However, it is important to consider the rate of application since high rates of glyphosate (especially greater than 1,440 g ae ha -1 ) may affect the development and production of RR2 maize.

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Resposta Diferencial Das Culturas De Milho Rr E Soja Rr À Exposição a Glyphosate E Adubação Fosfatada

Cited by 3 publications

References 23 publications

MANAGEMENT OF Urochloa ruziziensis WITH GLYPHOSATE IN INTEGRATED SYSTEM WITH GLYPHOSATE-RESISTANT CORN

MANAGEMENT OF Urochloa ruziziensis WITH GLYPHOSATE IN INTEGRATED SYSTEM WITH GLYPHOSATE-RESISTANT CORN

Uso de bioestimulante na reversão de injúria de glyphosate no milho convencional

Effect of glyphosate management, formulations and rates on the agronomic performance of maize with the cp4epsps gene

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