Uso de subdoses de glyphosate na supressão de espécies forrageiras consorciadas com milho

Matias, Matheus Lemos; Gonçalves, V. O.; Braz, Guilherme Braga Pereira; Andrade, Christiano Lima Lobo de; Silva, Alessandro Guerra da; Barroso, Alberto Leão de Lemos

doi:10.15361/1984-5529.2019v47n4p380-387

Cited by 6 publications

(1 citation statement)

References 15 publications

(19 reference statements)

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“…The high sensitivity of U. ruziziensis plants to a higher dose of glyphosate is related to the rapid translocation of the herbicide to the site of action, which may be greater in a situation of plant stress. Thus, lower doses than those recommended should be indicated to avoid plant death (Matias et al, 2019). The herbicides that presented an intermediate level of phytotoxicity against U. ruziziensis were tembotrione (42 and 84 g a.i.…”

Section: Resultsmentioning

confidence: 99%

Effects of herbicide underdoses on the vegetative development of Panicum maximum cultivars

Cruvinel¹,

Gonçalo²,

Moraes³

et al. 2021

Científica

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The advance of intercropping has generated the need for studies that evaluate methods of suppression of forage grasses in order to not harm the development of the commercial culture. The aim of this study is to evaluate the sensitivity of forage grasses to post-emergence herbicide application. To this end, an experiment was carried out in a greenhouse using a randomized complete block design in a 4 x 9 factorial scheme with four replicates. The first factor consisted of the forage grasses Urochloa ruziziensis, Panicum maximum cv. BRS Tamani, P. maximum cv. BRS Quênia, and P. maximum cv. BRS Zuri. The second factor consisted of the combination of eight herbicide treatments applied at post-emergence in association with atrazine (1200 g a.i. ha -1 ), besides a control treatment, without application. P. maximum cv. BRS Quênia was the least sensitive to post-emergence herbicide application. Tembotrione (42 and 84 g a.i. ha -1 ) and mesotrione (48 and 96 g a.i. ha -1 ) have potential for suppression of U. ruziziensis. Tembotrione (84 g a.i. ha -1 ), glyphosate (200 g a.i. ha -1 ), and nicosulfuron (7.8 g a.i. ha -1 ) have potential for suppression of the cv. BRS Quênia, and tembotrione (42 g a.i. ha -1 ) and mesotrione (96 g a.i. ha -1 ) have potential for the suppression of BRS Tamani. The P. maximum cv. BRS Zuri presented a higher plant height, shoot dry matter, and root dry matter than the other forages evaluated. For this forage, the use of nicosulfuron herbicides at post-emergence, regardless of the dose, reduced the shoot dry matter by 70%.

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Section: Resultsmentioning

confidence: 99%

Effects of herbicide underdoses on the vegetative development of Panicum maximum cultivars

Cruvinel¹,

Gonçalo²,

Moraes³

et al. 2021

Científica

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Glyphosate doses in the suppression of Megathyrsus maximus cv. BRS Quênia intercropped with transgenic maize

Mello,

Jakelaitis,

Silva

et al. 2023

Rev. bras. eng. agríc. ambient.

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In the intercropping of maize with Megathyrsus maximus, the application of herbicides is a technique that can be used to reduce competition between intercrops. This study aimed to evaluate the effect of different glyphosate doses on suppressing the growth of Megathyrsus maximus cv. BRS Quênia intercropped with maize, as well as in weed control. The randomized block experimental design was used and conducted in the field. The treatments consisted of the application of six glyphosate doses, 0; 48; 96; 240; 480; 960 g acid equivalent [a.e.] ha-1, and a maize treatment without the forage with 960 g acid equivalent [a.e.] ha-1. The dose of 260.87 g a.e. ha-1 provides a 50% response to the forage production variable; therefore, it has the potential to suppress M. maximus cv. BRS Quênia. The presence of forage reduces the density and dry mass of weeds, with the species in the weed community: Ricinus communis, Eleusine indica, Alternanthera tenella, Commelina benghalensis, Conyza sp., and Digitaria horizontalis.

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Glyphosate induced hormesis in Urochloa cultivars with sequential application

Codognoto,

Faria,

Maltoni

et al. 2023

Ciênc. anim. bras.

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Glyphosate is the most widely used herbicide and is responsible for a significant technical/productive advance in world agriculture. Glyphosate drift after its application to control weeds in agricultural fields can stimulate growth and/or productive performance in non-target plants, located adjacent to the treatment, characterizing the hormesis effect. However, the hormesis effect of glyphosate may be different depending on the plant species, its stage of development, and the applied dose. Considering the stimulus of forage biomass production for animal feed, this study aimed to assess the hormesis effect by successive applications of low glyphosate doses to cultivars of the genus Urochloa. The shoot and root productive responses of three grass cultivars (Urochloa brizantha cv. Marandu, U. brizantha cv. Piatã, and U. ruziziensis cv. Ruziziensis) were assessed in pots through leaf applications of subdoses of the acid equivalent (ae) of glyphosate (5.40, 10.80, 21.60, 43.20, and 86.40 g ae ha-1) and a control (no glyphosate application). Four sequential harvests, conducted with a frequency of 21 days in a completely randomized design and a 6 x 3 x 4 factorial arrangement, with three replications, were assessed. Doses equal to or higher than 43.20 g ae ha-1 of glyphosate, applied in two sequential applications impaired the biomass production of the assessed forages. Ruziziensis was the most susceptible cultivar to the phytotoxic effect. Sequential applications of the subdoses 5.40 and 10.80 g ae ha-1 of glyphosate characterized the hormesis effect, promoting the shoot and root biomass production of the forage plants U. brizantha cv. Marandu, U. brizantha cv. Piatã, and U. ruziziensis cv. Ruziziensis.

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Uso de subdoses de glyphosate na supressão de espécies forrageiras consorciadas com milho

Cited by 6 publications

References 15 publications

Effects of herbicide underdoses on the vegetative development of Panicum maximum cultivars

Effects of herbicide underdoses on the vegetative development of Panicum maximum cultivars

Glyphosate doses in the suppression of Megathyrsus maximus cv. BRS Quênia intercropped with transgenic maize

Glyphosate induced hormesis in Urochloa cultivars with sequential application

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