753 research outputs found
Distribution Of Environmental Compartments Of Herbicides Used In The Cotton, Coffee And Citrus Cultures [distribuição Nos Compartimentos Ambientais Dos Herbicidas Utiilizados Nas Culturas De Algodão, Café E Citros]
No full textThe aim of this paper was to evaluate the environmental fate of herbicides (acetochlor, 2,4-D, diuron, clomazone, thidiazuron, paraquat, simazine, fluazifo-p-butil, clethodim, oxufluorfen, flumioxazin, carfentrazone-ethyl, ametrina, trifluralin and MSMA) in cotton, coffee and citrus cultivation areas, applying the level I fugacity model. The methodology basically used the chemical and physical characteristics of the pesticides, environmental compartments and the fugacity equations. The preliminary evaluation of risk of contamination due to the use of these pesticides on the cultures studied was carried out swiftly, based on the chemical and physical properties of these products as the level I fugacity model was applied. For most of the herbicides evaluated, the water compartment was the most vulnerable. The prediction evaluation study using fugacity level I was found to be a relevant tool for the environmental fate of the herbicides studied for cotton, coffee and citrus cultures.271123132Bru, R., Carrasco, J.M., Paraíba, L.C., Unsteady state fugacity model by a dynamic control system (1998) Appl. Math Model., 22 (7), pp. 485-494Calamari, D., Vighi, M., Bacci, E., The use of terrestrial plant biomass as a parameter in the fugacity model (1987) Chemosphere, 16 (10-12), pp. 2359-2364Mackay, D., Paterson, S., Calculating fugacity (1981) Environ. Sci. Technol., 15 (9), pp. 1006-1014Mackay, D., (1991) Multimedia Environmental Models: The Fugacity Approach, p. 257. , Boca Raton: Lewis PublishersParaíba, L.C., (1999) Modelización de la Fugacidad Mediante Sistemas Dinámicos Discretos, p. 199. , Tesis (Doctoral) - Universidad Politécnica de Valência, Valência, 1999Paraíba, L.C., Carrasco, J.M., Bru, R., Level IV fugacity model by continuous time control system (1999) Chemosphere, 38 (8), pp. 1763-1775Paraíba, L.C., Simulation of the fate of the insecticide carbifuran in a rice field using a level IV fugacity model (2007) Span J Agric Res., 5 (1), pp. 43-50Plese, L.P.M., Silva, C.L., Foloni, L.L., Previsão da distribuição ambiental dos herbicidas utilizados na cultura da cana-de-açúcar (2006), p. 133. , CONGRESSO BRASILEIRO DA CIÊNCIA DAS PLANTAS DANINHAS, 25., 2006. Brasília. Anais... BrasíliaPlese, L.P.M., Silva, C.L., Foloni, L.L., Previsão da distribuição ambiental dos herbicidas utilizados na cultura do milho (2006), p. 134. , CONGRESSO BRASILEIRO DA CIÊNCIA DAS PLANTAS DANINHAS, 25., 2006, Brasília. Anais... BrasíliaSilva, C.L., Previsão ambiental da distribuição dos pesticidas aplicados na cultura do arroz (2007) Pestic.: R. Ecotoxicol Meio Amb., 17 (1), pp. 75-86Tomlin, C.D.S., (2000) The Pesticide Manual, , Farnham: British Crop Protection CouncilYenigün, O., Sohtorik, D., Calculation with the level II fugacity model for selected organophosphorus insecticides (1995) Water Air Soil Poll., 84 (1), pp. 175-18
Letter to L.L. McGee from unknown author regarding members of an all state team
No full textLetter listing selections for the all state team for Douglass High School
Essay about how the image of Maine is constructed by institutions like L.L. Bean
No full textEssay about how the image of Maine is constructed by institutions like L.L. Bean and Bert and I. The author asks if local imagemakers are more true to life than their mass market counterparts
Avaliação da sensibilidade de diversas espécies de plantas daninhas aquáticas ao carfentrazone-ethyl, em ambiente controlado Assessment of sensitivity of several aquatic weeds to carfentrazone-ethyl under controlled environment
No full textPlantas aquáticas, especialmente macrófitas, tornam-se sério problema em hidrelétricas, afetando a múltipla utilização dos corpos d'água, incluindo produção de peixes e atividades de pesca, perdas d'água por evapotranspiração, esportes aquáticos, canoagem, irrigação e produção de energia nas usinas hidrelétricas. Com o objetivo de analisar o potencial de uso do carfentrazone-ethyl no controle das principais plantas daninhas aquáticas no Brasil, foi instalado um experimento em vasos com água. Utilizaram-se os seguintes tratamentos herbicidas (g i.a. ha-1): carfentrazone-ethyl a 15, 30 e 60; glyphosate a 4.536; 2,4-D a 4.690; imazapyr a 1.250; e uma testemunha sem herbicida. Esses tratamentos foram testados nas seguintes espécies: Eichhornia crassipes, Salvinia auriculata, Pistia stratiotes, Myriophyllum aquaticum, Brachiaria arrecta, Hydrocotyle umbellata, Typha sp. e Echinochloa polystachya. As avaliações foram efetuadas aos 7, 14, 21 e 28 dias após os tratamentos. Os resultados mostraram que o carfentrazone-ethyl foi eficiente no controle de E. crassipes (maior dose) e P. stratiotes (duas maiores doses), com efeito supressivo sobre S. auriculata. Foi observado que nas outras plantas daninhas estudadas não houve eficiência de controle.Aquatic weeds, especially macrophytes, are a serious problem in hydroelectric plant systems, affecting the multiple use of water, such as fish production and fishing activities, water losses by evapotranspiration, aquatic sports, boating, irrigation and hydroelectric power production. An experiment using boxes filled with water was carried out to analyze the potential use of carfentrazone-ethyl in the control of the main aquatic weeds in Brazil. The following herbicide treatments (g i.a. ha-1) were used: carfentrazone-ethyl at 15, 30 and 60; glyphosate at 4,536; 2,4D at 4,690; imazapyr at 1,250, and no herbicide. These treatments were tested on the species: Eichhornia crassipes, Salvinia auriculata, Pistia stratiotes, Myriophyllum aquaticum, Brachiaria arrecta, Hydrocotyle umbellata, Typha sp. and Echinochloa polystachya. The evaluations were conducted at 7, 14, 21 and 28 days after treatments. The results showed that carfentrazone-ethyl is efficient in the control of E. crassipes (higher rate), P. stratiotes (the two highest rates) having a suppressive effect on S. auriculata. No efficacy was observed on the other weeds studied
Distribuição nos compartimentos ambientais dos herbicidas utiilizados nas culturas de algodão, café e citros Distribution of environmental compartments of herbicides used in the cotton, coffee and citrus cultures
No full textO objetivo deste trabalho foi avaliar o destino ambiental dos herbicidas acetochlor, 2,4-D, diuron, clomazone, thidiazuron, paraquat, simazine, fluazifop-p-butil, clethodim, oxyfluorfen, flumioxazin, carfentrazone-ethyl, ametrina, trifluralin e MSMA em áreas de cultivo de algodão, café e citros, utilizando o modelo de fugacidade nível I. Na metodologia foram utilizadas basicamente as características físico-químicas dos herbicidas, os compartimentos ambientais e as equações de fugacidade. A avaliação preliminar do risco de contaminação pelo uso de herbicidas nas culturas de algodão, café e citros pode ser feita de forma expedita a partir das propriedades físico-químicas desses produtos, aplicando o modelo de fugacidade nível I. Para a maioria dos herbicidas avaliados, o compartimento água foi o mais vulnerável. O estudo de avaliação da predição em que se empregou o nível de fugacidade I demonstrou ser uma ferramenta importante no destino ambiental dos herbicidas estudados para as culturas de algodão, café e citros.The aim of this paper was to evaluate the environmental fate of herbicides (acetochlor, 2,4-D, diuron, clomazone, thidiazuron, paraquat, simazine, fluazifo-p-butil, clethodim, oxufluorfen, flumioxazin, carfentrazone-ethyl, ametrina, trifluralin and MSMA) in cotton, coffee and citrus cultivation areas, applying the level I fugacity model. The methodology basically used the chemical and physical characteristics of the pesticides, environmental compartments and the fugacity equations. The preliminary evaluation of risk of contamination due to the use of these pesticides on the cultures studied was carried out swiftly, based on the chemical and physical properties of these products as the level I fugacity model was applied. For most of the herbicides evaluated, the water compartment was the most vulnerable. The prediction evaluation study using fugacity level I was found to be a relevant tool for the environmental fate of the herbicides studied for cotton, coffee and citrus cultures
Development and characterization of a thermostable nckel-alumina methanation catalyst
No full textApplied Science
Matthew Flinders, Capt. R.N. 1809, author of Trim [picture] /
No full textTitle from inscription l.r.; Inscription l.l.: Recollection of a miniature.; Signature l.l.; In his Album of drawings.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.pic-an6325371; R8205
- …
