Encontrados 12 documentos, a visualizar página 1 de 2
Emergence flow of weeds as the result of temperature and luminosity conditions ...
Zandoná, Renan Ricardo; Agostinetto, Dirceu; Ulguim, André da Rosa; Campos, Rogério Costa; Vargas, Andrés Antonio Monge; Silva, Jéssica Dias Gomes daLevels of weed infestation can be inferred from climate information since every species requires specific conditions for its germination process. This study aimed to evaluate weed species and their emergence flow in hilly areas, when subjected to different environmental conditions of temperature and luminosity. Two experiments were carried out in a completely randomized design with four replications. In the fir...
Low level resistance of wild poinsettia biotypes to glyphosate and alternative ...
Agostinetto, Dirceu; Ulguim, André da Rosa; Zandoná, Renan Ricardo; da Silva, Jéssica Dias Gomes; da Silva, Bruno Moncks; Várgas, LeandroIn the State of Rio Grande do Sul (RS), Southern Brazil, glyphosate has not been capable of controlling wild poinsettia (Euphorbia heterophylla L.) in soybean fields, thus, suggesting resistance to this herbicide. Therefore, this study aimed at evaluating sensitivity of wild poinsettia biotypes to glyphosate, identifying the occurrence of resistance of wild poinsettia to the herbicide in RS state and determinin...
Propriedades enzimáticas da enzima ALS de Cyperus difformis e mecanismo de resi...
Magro, Taísa Dal; Rezende, Sebastião Tavares de; Agostinetto, Dirceu; Vargas, Leandro; Silva, Antônio Alberto da; Falkoski, Daniel LucianoCyperus difformis L. é uma planta daninha ocorrente em lavouras de arroz irrigado, que tem apresentado dificuldade de controle devido à resistência a herbicidas inibidores da enzima ALS. Os objetivos deste trabalho foram investigar características cinéticas da enzima ALS de biótipos de C. difformis e determinar as bases bioquímicas da resistência da espécie ao herbicida pyrazosulfuron-ethyl. Para isso, foram co...
Interference of volunteer corn in glyphosate resistant soybean and chemical con...
Pertile, Mariane; Cechin, Joanei; Zimmer, Vinicius; Agostinetto, Dirceu; Vargas, LeandroThe successive use of Roundup Ready crops may difficult the management of volunteer plants originated from seed losses during harvest. In soybean, volunteer corn plants can exhibit higher interference and cause reduce yield depending on their density. The aim of this study was to quantify the economic threshold level (ETL) in soybean as a function of the competition of volunteer corn and to evaluate the chemica...
Does competition between soybeans and Wild Poinsettia with low-level resistance...
Ulguim, André da Rosa; Agostinetto, Dirceu; Oliveira, Claudia de; Ruchel, Queli; Silva, Jessica Dias Gomes da; Vargas, Leandro; Avila, Luis AntonioThe Wild Poinsettia (Euphorbia heterophylla L.) has elevated potential to reduce the soybean yield and is a difficult to control plant due to herbicide resistance. The objectives of this study were to determine the changes in the photosynthetic physiological parameters, secondary metabolite levels, cellular damage, and antioxidant system activity in soybean plants and Wild Poinsettia biotypes with a low level o...
Wheat Fundacep Horizonte competitive ability under competition with ryegrass
Tarouco, Camila Peligrinotti; Agostinetto, Dirceu; Langaro, Ana Claudia; Nohatto, Marcos André; Mariani, Franciele; da Silva, Bruno MonksThe weeds present in wheat compete for several factors negatively impacting on cropproductivity. In this context, the goal of the study was to morphologically analyze wheat andryegrass in response to stress caused by competition between crop and weed. The experiment wasconducted in completely randomized design with 4 replications in a replacement series with apopulation of 64 plants per pot. Treatments consiste...
Yield loss and economic thresholds of yellow nutsedge in irrigated rice in func...
Agostinetto, Dirceu; Westendorff, Nixon da Rosa; Ulguim, André da Rosa; Nohatto, Marcos André; de Avila, Luis AntonioWeeds cause reduction in the rice yield. Little is known about the competitive ability of yellow nutsedge (Cyperus esculentus) with rice and the extent of the economic threshold (ET). The aim of this study was to determine the fit of the regression model to estimate hyperbolic yield losses and ET of yellow nutsedge in rice due to the cycle of cultivars (BRS Querência - Early cycle and IRGA 424 - mid cycle). For...
Ocorrência de agrotóxicos em águas subterrâneas de áreas adjacentes a lavouras ...
Silva, Diecson Ruy Orsolin da; Avila, Luis Antonio de; Agostinetto, Dirceu; Bundt, Angela da Cas; Primel, Ednei Gilberto; Caldas, Sergiane SouzaSubmitted by Paula Gautério (paulaporto_g@hotmail.com) on 2014-02-12T22:33:17Z No. of bitstreams: 1 Ocorrência de agrotóxicos em águas subterrâneas de áreas adjacentes a lavouras de arroz irrigado.pdf: 223427 bytes, checksum: f1e4d4c15ed0f3dee9e8151907dcf25c (MD5); Approved for entry into archive by Gabriela Silva da Rosa (gabrielasilvadarosa@gmail.com) on 2014-02-22T21:18:33Z (GMT) No. of bitstreams: 1 Ocorrên...
Agronomic characteristics of wheat due to seed treatment and timing of nitrogen...
Ulguim, André da Rosa; Agostinetto, Dirceu; Martini, Alfran Tellechea; Westendorff, Nixon da Rosa; Langaro, Ana CláudiaWheat (Triticum aestivum L.) is the most economically important crop between winter cereals. Two experiments were conducted to evaluate the effect of seed treatment with fungicides to delay crop emergence and influence of nitrogen application time on morphological and physiological variables and yield components of wheat. The first, in the greenhouse and completely randomized design, tested two seed treatments,...
Cover crop management in the weed control and productive performance in corn
Moraes, Pedro Valério Dutra de; Agostinetto, Dirceu; Panozzo, Luiz Eduardo; Oliveira, Claudia; Vignolo, Gerson Kleinick; Markus, CatarineThe objective of the study was evaluate the allelopathy of cover species, associated to management practices and use of nicosulfuron herbicide on the productive performance of corn. The experimental design consisted of complete randomized block with four replications. The treatments were: cover species, cover management and application or not of post-emergence herbicide. The variables evaluated were: number of...