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| Concenço,G.; Ferreira,E.A.; Aspiazu,I.; Silva,A.F.; Galon,L.; Ferreira,F.A.; Silva,A.A.; Andres,A.. |
| Objetivou-se com este trabalho avaliar as características associadas à eficiência de uso da água por plantas de arroz irrigado, quando sob competição com biótipos de capim-arroz resistente ou suscetível ao herbicida quinclorac, em diferentes densidades. O experimento foi realizado em casa de vegetação, em delineamento de blocos casualizados e esquema fatorial 2 x 6 (dois biótipos e seis densidades de infestação), com quatro repetições. Os tratamentos consistiram em manter uma planta de arroz no centro da unidade experimental, competindo com 0, 1, 2, 3, 4 ou 5 plantas do biótipo resistente ou suscetível na periferia. Aos 50 DAE (dias após a emergência) foram avaliadas a condutância estomática de vapores de água, a pressão de vapor na câmara subestomática, a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Capim-arroz; Resistência; Quinclorac; Arroz irrigado. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582009000200006 |
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| Marchesan,Enio; Zanella,Renato; Avila,Luis Antonio de; Camargo,Edinalvo Rabaioli; Machado,Sérgio Luiz de Oliveira; Macedo,Vera Regina Mussoi. |
| Irrigated rice production can involve environmental contamination with pesticides due to the proximity of the fields to rivers and to management problems. During three years (2000 to 2003) the rice herbicides clomazone, propanil and quinclorac were quantified in water during the rice growing season, in the Vacacaí and Vacacaí-Mirim Rivers, located in Rio Grande do Sul (RS) State, Brazil. Water samples were taken at several locations in each river, selected by their importance in terms of rice drainage area. The samples were analyzed by HPLC-UV. At least one herbicide was detected in 41% of the samples from the Vacacaí River and 33% from the Vacacaí-Mirim River. The most frequent herbicide in both rivers and in each year was clomazone. The amount of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Clomazone; Environmental impact; Pesticides; Propanil; Quinclorac. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000200005 |
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| Miron,Denise dos Santos; Silva,Lenise Vargas Flores da; Golombieski,Jaqueline Ineu; Machado,Sérgio Luiz de Oliveira; Marchezan,Enio; Baldisserotto,Bernardo. |
| The goal of the present work was to determine the lethal concentration (LC50) (96h) of clomazone, metsulfuron-methyl, and quinclorac, herbicides used in rice culture, for the silver catfish, Rhamdia quelen. Fingerlings were exposed to different concentrations of the herbicides. The LC50s were 7.32µL L-1 for clomazone and 395mg L-1 for quinclorac. The LC50 for metsulfuron-methyl was not obtained since all fingerlings survived even at 1200mgL-1. Probably only clomazone can lead to mortality among silver catfish reared in the rice culture system. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Quinclorac; Clomazone; Metsulfuron-menthyl; Rhamdia quelen; Silver catfish; LC50. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782004000500021 |
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