Management of Maize Stover With Underdoses Rates of Glyphosate Applications in No-Tillage

Jasper, Samir Paulo; Picoli, Gilmar José; Velini, Edivaldo Domingues; Sousa, Saulo Fernando Gomes de; Carbonari, Caio Antônio

doi:10.1590/s0100-83582015000300016

Cited by 3 publications

(4 citation statements)

References 28 publications

(33 reference statements)

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“…According to Costa et al (2015), plant residues with a higher C/N ratio have a lower decomposition rate. In this sense, according to Jasper et al (2015), the use of glyphosate promotes a reduction in lignin and cellulose contents in the plant material, thus reducing the C/N ratio. However, in our study, glyphosate application did not lead to changes in the decomposition process of the remaining straw of plants controlled with this herbicide.…”

Section: Resultsmentioning

confidence: 99%

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Productivity, Control, and Decomposition of Irrigated Forage Species under Glyphosate Doses and Shading

et al. 2018

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Light intensity available in growing environments may influence the susceptibility of plants to glyphosate and decomposition of their residues. This study aimed to assess the productivity, control, and decomposition of forage straw submitted to glyphosate doses and exposed to full sun and 50% shade. Two experiments were carried out, one for Piatã grass (Urochloa brizantha cv. Piatã) and other for Tanzania grass (Megathyrsus maximus cv. Tanzania). The experimental design was a randomized block design with strip-plot and four replications. Two growing environments (at full sun and under 50% shade) were installed in strips in the growing area, combined with six doses of glyphosate (0, 360, 720, 1,080, 1,440, and 1,800 g a.e. ha-1) used for forage desiccation. Shade did not change Tanzania grass productivity (p<0.05), but it reduced Piatã grass productivity (p>0.05), suggesting its low tolerance to light restriction. Tanzania grass is more tolerant to glyphosate when compared to Piatã grass, especially at full sun conditions. In general, the evaluated forages present a high susceptibility to glyphosate as incident radiation is reduced, which allows using lower doses to desiccate them in shaded environments. Straw decomposition of Piatã and Tanzania grasses was slower under shading. In this environment with light restriction, straw is more durable and has a better quality for the no-tillage system.

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Section: Resultsmentioning

confidence: 99%

“…Among its characteristics are the low cost, fast degradation, broad spectrum of action, and low toxicity to mammals. However, chemical control with glyphosate may promote changes in plant chemical composition, altering the decomposition rates of the material resulting from desiccation (Costa et al, 2015;Jasper et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Productivity, Control, and Decomposition of Irrigated Forage Species under Glyphosate Doses and Shading

et al. 2018

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“…Mais recentemente, tem crescido o interesse dos produtores pelo cultivo consorciado de milho resistente ao herbicida glifosato, com evento de transgenia, associado à espécie Urochloa ruzizienis e tendo-se o herbicida glifosato, do grupo dos inibidores de EPSPs (enzima enol-piruvil-shiquimato-fostato-sintase) como ferramenta de supressão da forrageira como alternativa ao herbicida padrão nicosulfuron do grupo dos inibidores de ALS (enzima aceto-lactato-sintase), conforme relataram Vidal et al 2014 Esse consórcio aliaria uma espécie com ótimas características como forrageira e planta de cobertura a uma cultura resistente ao herbicida de manejo, o que possibilitaria diversificação de princípio ativo e mecanismo de ação do produto, além de boa eficiência do glifosato na supressão ou dessecação da forrageira para pastagem ou palhada (JASPER et al, 2015;QUEIROZ et al, 2016;MACHADO et al, 2018).…”

Section: Introductionunclassified

Efeito Do Estádio De Desenvolvimento E Doses De Herbicida Na Supressão De Crescimento De Urochloa Ruziziensis

Corrêa¹,

Melo²,

Freitas³

et al. 2019

Agrarian

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RESUMO Este trabalho objetivou avaliar doses do herbicida glifosato para a supressão do desenvolvimento da forrageira Urochloa ruziziensis (Sin. Brachiaria ruziziensis) nos estádios de um e dois perfilhos, em sistema de integração lavoura-pecuária com milho resistente ao herbicida glifosato. Os tratamentos foram testemunha sem pulverização e glifosato nas doses de 18 g e.a.ha-1 e 36 g e.a.ha-1 para forrageira no estádio de um perfilho e testemunha sem pulverização e glifosato nas doses de 54 g e.a.ha-1 e 72 g e.a.ha-1 para forrageira no estádio de dois perfilhos. Os resultados mostraram que as doses testadas não reduziram o perfilhamento da forrageira nos dois estádios de desenvolvimento estudados. As doses testadas reduziram a altura de plantas da forrageira em ambos os estádios de desenvolvimento e glifosato a 36 g e.a.ha-1 apresentou o maior efeito na redução da altura de plantas no estádio de 1 perfilho. As doses de 54 g e.a.ha-1 e 72 g e.a.ha-1 de glifosato reduziram, igualmente, a altura de plantas no estádio de 2 perfilhos. PALAVRAS-CHAVE: Brachiaria ruziziensis, glifosato, integração lavoura pecuária.

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“…More recently, there has been significant interest in the integration of corn with RR transgenic event associated with the species Urochloa ruziziensis, using the glyphosate herbicide in forage suppression as an alternative to the nicosulfuron herbicide (Silveira et al, 2017;São Miguel et al, 2018). This would combine a species with excellent characteristics such as forage and cover crops with a resistant crop to the herbicide that would allow active principle diversification, as well as good suppression of the forage for pasture or soil cover (Lima et al, 2014;Ceccon and Concenço, 2014;Jasper et al, 2015;Machado et al, 2018).…”

Section: Introductionmentioning

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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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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Management of Maize Stover With Underdoses Rates of Glyphosate Applications in No-Tillage

Cited by 3 publications

References 28 publications

Productivity, Control, and Decomposition of Irrigated Forage Species under Glyphosate Doses and Shading

Productivity, Control, and Decomposition of Irrigated Forage Species under Glyphosate Doses and Shading

Efeito Do Estádio De Desenvolvimento E Doses De Herbicida Na Supressão De Crescimento De Urochloa Ruziziensis

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

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