Eficiência de herbicidas aplicados em pós-emergência em milho consorciado com Urochloa brizantha cv. Marandu

Rezende, Paula Nogueira; Jakelaitis, Adriano; Moraes, Nayara Cruvinel de; Cardoso, Isabella Sichierski; Araújo, Vinícius Tavares de; Tavares, Cássio Jardim

doi:10.5327/z1982-8470201400031985

Cited by 5 publications

(5 citation statements)

References 12 publications

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“…This reduction, when deriving from the application of the herbicide, was possibly caused by its action, which interfered in the development of the forage grasses. These results corroborate what was observed by Rezende et al (2014) who, when evaluating the use of bentazon at the 0.72 kg ha -1 dose in maize intercrop with palisade grass, observed a reduction in the dry matter of this forage species.…”

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confidence: 91%

Phytosociology in Degraded and Renewed Pastures in Agrosilvopastoral Systems

et al. 2018

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In pastures, the incidence of weeds reduces the productivity and quality of forage. The identification of the weed species in pastures is fundamental to choose the renewal method. Thus, the objective of this work was to perform phytosociology before and after the renewal of a Brachiaria decumbens pasture, with the implantation of agrosilvopastoral systems. Eighteen different crop arrangements for pasture renewal were evaluated. The renewal systems were by eucalyptus integration (at 12 x 2 m or 12 x 3 m spacings) with maize, Brachiaria brizantha cv. Marandu (palisade grass) and/or Macrotyloma axillare (perennial horsegram), or monoculture and intercropping of palisade grass and perennial horsegram, as well as the evaluation of the application or not of the herbicide bentazon, at the recommended dose for maize crops (0.72 kg ha-1). Relative frequency, relative density, relative abundance, relative dominance, coverage value index, importance value index, dry matter and similarity index were evaluated. In the first survey, before the pasture renewal, 23 plant species were identified. After the implantation of agrosilvopastoral systems, the species Sida cordifolia, Lantana camara and B. decumbens were the only occurring ones before and after the renewal of the pasture with agrosilvopastoral systems. The use of palisade grass and the application of the herbicide were efficient in controlling weeds. In systems that contained palisade grass and perennial horsegram, the latter was not found in the survey conducted one year after the implantation.

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confidence: 91%

Phytosociology in Degraded and Renewed Pastures in Agrosilvopastoral Systems

et al. 2018

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“…Competition can be mitigated with the adoption of agronomic practices, such as herbicide application, which can partially inhibit the initial growth rate of forages (ADEGAS; VOLL; GAZZIERO, 2011;REZENDE et al, 2014). Therefore, to achieve success in the intercropping between annual and forage crops it is necessary to guarantee the initial competitive advantage of the crop by environmental resources, which can be achieved with applications of herbicide underdoses.…”

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confidence: 99%

SUPPRESSION OF Urochloa brizantha AND U. ruziziensis BY GLYPHOSATE UNDERDOSES

et al. 2019

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Intercropping of Urochloa species with corn is an alternative to enable the no-tillage system, besides influencing weed community. Therefore, the investigation of underdoses of the herbicide glyphosate to manage grasses in intercropping systems, avoid grain yield losses, and make feasible intercropping in agricultural areas is important. This study aimed to evaluate glyphosate underdoses in the suppression of Urochloa brizantha cv. Marandu and Urochloa ruziziensis and weed control. Two tests were conducted under field conditions in a randomized block design with four replications and eight treatments consisting of increasing glyphosate doses (0, 54, 108, 270, 378, 540, 756, and 1.080 g a.e. ha−1). All treatments received a dose of 1.200 g a.i. ha−1 of atrazine. Evaluations of phytointoxication of brachiaria plants were carried out at 7, 14, 21, and 28 days after application. Moreover, total dry matter, leaf dry matter, stem dry matter, leaf to stem ratio, and canopy height of brachiaria plants and density and dry matter production of weed community were evaluated at 80 and 125 days after sowing. Glyphosate underdoses lower than 238 and 105 g a.e. ha−1 have potential to be investigated aiming at the management of U. brizantha cv. Marandu and U. ruziziensis, respectively.

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“…Similar results for the control of Cyperus spp. were found with the herbicide bentazon in corn (Rezende et al, 2014).…”

Section: Resultsmentioning

confidence: 95%

“…The association of herbicides has been studied in corn cultivation, especially glyphosate in association with nicosulfuron, atrazine, 2,4-D, bentazon, and tembotrione or even among associations of the latter herbicides (Jakelaitis et al, 2007;Rezende et al, 2014;Vieira Junior et al, 2015;Osório et al, 2015). Armel et al (2008) assessed the effect of ammonium glufosinate with mesotrione whereas Silva et al (2017) assessed ammonium glufosinate in association with glyphosate and atrazine.…”

Section: Introductionmentioning

confidence: 99%

Ammonium Glufosinate Associated with Post-Emergence Herbicides in Corn with the cp4-epsps and Pat Genes

et al. 2019

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With the possibility of using ammonium glufosinate in corn, studies on its association with other herbicides are essential. The aim of this study was to assess weed control and herbicide selectivity in association with ammonium glufosinate in corn containing the pat and cp4-epsps genes. The experiment was carried out under field conditions in two sites in a randomized block design with four replications. Treatments consisted of ammonium glufosinate, glyphosate, ammonium glufosinate + glyphosate, ammonium glufosinate + nicosulfuron, ammonium glufosinate + atrazine, ammonium glufosinate + tembotrione, ammonium glufosinate + mesotrione, ammonium glufosinate + carfentrazone ethyl, ammonium glufosinate + bentazon, ammonium glufosinate + 2,4-D, control without weeding, and hand-weeded control. Visual assessments were performed regarding damage, electron transport rate in photosystem II (ETR), ammonia quantification, height, and grain yield of corn plants, as well as weed control at both sites. The application of ammonium glufosinate and its associations did not provide a reduction in productivity when compared to the hand-weeded control. Some treatments presented higher levels of visual damage and ammonia accumulation, but without a yield reduction. Therefore, herbicide mixture with ammonium glufosinate may be an alternative to weed control without damaging corn crop, which presents in its genetic constitution the cp4-epsps and pat genes. Planta Daninha 2019; v37:e019184453 KRENCHINSKI, F.H. et al. Ammonium glufosinate associated with post-emergence herbicides in corn with the cp4-epsps and pat ...2 visual e acúmulo de amônia, porém sem redução de produtividade. Portanto, a mistura de herbicidas com o amônio-glufosinate pode ser uma alternativa para o controle de plantas daninhas, sem causar danos à cultura do milho, que apresenta na sua constituição genética os genes cp4-epsps e pat.Palavras-chave: acúmulo de amônia, fosfinotricina, fluxo de transporte de elétrons, resistência a herbicidas, Zea mays.

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Eficiência de herbicidas aplicados em pós-emergência em milho consorciado com Urochloa brizantha cv. Marandu

Cited by 5 publications

References 12 publications

Phytosociology in Degraded and Renewed Pastures in Agrosilvopastoral Systems

Phytosociology in Degraded and Renewed Pastures in Agrosilvopastoral Systems

SUPPRESSION OF Urochloa brizantha AND U. ruziziensis BY GLYPHOSATE UNDERDOSES

Ammonium Glufosinate Associated with Post-Emergence Herbicides in Corn with the cp4-epsps and Pat Genes

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