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| Richter,Gean Leonardo; Streck,Nereu Augusto; Zanon,Alencar Junior; Ulguim,André da Rosa; Kruse,Nelson Diehl; Santos,Gionei Alves de Assis dos; Cera,Jossana Ceolin; Ribas,Giovana Ghisleni; Duarte Junior,Ary José; Pilecco,Isabela Bulegon. |
| Abstract: The objective of this work was to model weedy rice (Oryza sativa) and barnyard grass (Echinochloa spp.) competition with flood-irrigated rice, introducing it as a submodule into the SimulArroz model. The competition of both weeds with irrigated rice was modeled using the rectangular hyperbola equation. The “i” and “a” coefficients of the rectangular hyperbola for each of these weeds were obtained from the literature and from field experiments carried out in the state of Rio Grande do Sul, Brazil. In SimulArroz, yield loss was applied to penalize yield in all three technological levels (high, medium, and low) of physiological maturity. For weedy rice, the coefficient values of imean for the high, medium, and low technological levels were 1.04,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Barnyard grass; Modeling; Weedy rice; Yield loss. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000102508 |
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| Ulguim,André da Rosa; Vargas,Leandro; Agostinetto,Dirceu; Magro,Taísa Dal; Westendorff,Nixon da Rosa; Holz,Marcelo Timm. |
| O objetivo deste trabalho foi avaliar a resistência de capim pé-de-galinha (Eleusine indica) ao glifosato, em lavouras de soja transgênica; avaliar o efeito de aplicações de glifosato em diferentes estádios de desenvolvimento; identificar práticas agronômicas associadas à seleção de biótipos resistentes; e avaliar a eficiência dos herbicidas cletodim, fluazifope-P-butílico, clomazona, glufosinato de amônio e glifosato nas plantas resistentes. Plantas escapes ao tratamento com glifosato foram coletadas em 24 propriedades, no Rio Grande do Sul. As plantas foram cultivadas em casa de vegetação, tendo-se avaliado a sua resistência ao glifosato. Os acessos resistentes foram selecionados e avaliados quanto ao efeito da aplicação do glifosato em diferentes... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eleusine indica; Glycine max; Dosagem; Eficiência de controle; Estádio fenológico; Resistência ao glifosato; Roundup ready. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2013000100003 |
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| Agostinetto,Dirceu; Ulguim,André da Rosa; Vargas,Leandro; Silva,Jessica Dias Gomes da; Langaro,Ana Claudia. |
| Abstract: The objective of this work was to compare wild poinsettia (Euphorbia heterophylla) biotypes as to their morphological characteristics, as well as to determine their genetic similarity in the state of Rio Grande do Sul, Brazil, and to confront the light compensation point of susceptible biotypes and of biotypes with low-resistance level to glyphosate. Besides the morphology analysis, the study included the genetic characterization, by AFLP, of susceptible (GR50= 58.65 g ha-1 a.e.) biotypes and of biotypes with low resistance (GR50= 310.36 g ha-1 a.e.) to glyphosate. The competitive ability of the biotypes was inferred according to their light compensation point. The observed morphological characteristics do not allow to differentiate biotypes as... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Euphorbia heterophylla; AFLP; Competitive ability; EPSPs inhibitor herbicide; Light compensation point; Resistance to herbicide. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017001100987 |
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| Oliveira,Maurício Limberger; Marchesan,Enio; Soares,Camille Flores; Farias,Júlia Gomes; Ulguim,André da Rosa; Fleck,Alisson Guilherme; Coelho,Lucas Lopes. |
| ABSTRACT The residue of imidazolinone herbicides in soil can be detrimental to soybean cultivation in rotation with Clearfield® rice. Thus, this research aimed to evaluate the ryegrass phytoremediation capacity on the imazapyr+imazapic residue in the soil in two soil moisture conditions in the off-season, and the effect on soybean growth in the next growing season. Two experiments were conducted between 2016 and 2017 in Santa Maria, Rio Grande do Sul state, Brazil. It was used the randomized block design in a 3 × 2 factorial. The first factor being the residue in the soil of 0, 210 and 420 g c.p.·ha–1 of the formulated mixture of the herbicides imazapyr+imazapic(525 + 175 g a.i.·kg–1) applied to rice in the 2015/2016 growing season, and the second factor... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lolium multiflorum; Glycine max; Imidazolinones; Residue. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000300306 |
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| Ulguim,André da Rosa; Carlos,Filipe Selau; Santos,Rodrigo Areze da Silva; Zanon,Alencar Junior; Werle,Isabel Schlegel; Beck,Mattheus. |
| ABSTRACT: This research aimed to evaluate the phytosociology of weeds in irrigated rice in different soil management systems and crop rotation intensity. Therefore, two field studies were carried out. Study 1 was conducted in an area that has been cultivated since 1994 with three cultivation systems: direct, pre-germinated and conventional ones. Study 2 was carried out in an experimental area in five Integrated Farming Systems, with crop rotation. Phytosociological evaluations were conducted when rice was fully blooming, in the first study, and when grain filling was ending, in the second study. Pre-germinated system of rice cultivation has predominance of aquatic weeds. Conventional system when compared with direct sowing has lower weed densities.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Red rice; Sustainable intensification. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018001100150 |
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