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| Registros recuperados: 154 | |
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| Antuniassi,Ulisses R.; Miller,Paul; Paice,Mark. |
| A method for measuring the performance of agricultural injection metering systems was developed and used to assess the characteristics of three commercial system designs. Steady-state characteristics were measured using both colored dyes and salt as tracers. Dynamic response characteristics were determined by measuring salt concentration downstream of the injection point by monitoring electrical conductivity of the spray solution. Salt added to a viscous test liquid changed viscosity slightly only at low shear rates and it is concluded that this liquid is appropriate for use in evaluation tests with injection systems. Results from tests with 2 systems specifically designed for operation with agricultural sprayers gave a linear response with both water and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Precision agriculture; Sprayers; Pesticides. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662002000100028 |
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| Bocquene, Gilles; Franco, Alain. |
| In January and February 2002, the presence of certain agricultural pesticides throughout the coastline of the Caribbean island of Martinique was investigated. The tropical climate of the French West Indies is suitable for banana production, which requires intensive use of pesticides. An inventory of all pesticides used on the island (compounds and tonnage) was compiled. Surveys and analyses revealed the presence of pesticides in the plumes of seven rivers. The organochlorine chlordecone and metabolites of aldicarb were detected at nearly all of the monitored sites, even though the use of chlordecone has been prohibited since 1993. Two triazines (ametryn and simazine) were also identified. The concentrations of carbamates and triazines detected in the water... |
| Tipo: Text |
Palavras-chave: Aldicarb; Chlordecone; Triazines; Pesticides; Contamination; Martinique Island. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-879.pdf |
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| Shumway, C. Richard; Chesser, Rayanne R.. |
| The impact of an ad valorem pesticide tax on cropping patterns and pesticide use was examined in the South Central Texas Crop Reporting District. Output supply equations were econometrically estimated and used in the simulation. A 25 percent tax on pesticide was estimated to have major impacts on cropping patterns and on pesticide use. Assuming other input and output prices were unaffected, the supply of one important crop would fall by more than half. Demand for some of the highly soluble and persistent pesticides, which present the greatest threat to groundwater quality, would also decrease substantially (some as much as 50 percent). |
| Tipo: Journal Article |
Palavras-chave: Crops; Dual model; Pesticides; Water quality; Supply; Crop Production/Industries. |
| Ano: 1994 |
URL: http://purl.umn.edu/15433 |
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| BARIZON, R. R. M.; MATSUURA, M. I. da S. F.; SCACHETTI, M. T.; SILVA, G. B. S. da; COSTA, M. P.; GAROFALO; LANES, V. F. de; PICOLI, G.; PIGHINELLI, A. L. M. T.; MORANDI, M. A. B.. |
| Abstract: Several methodologies have been proposed to assess the impact of pesticides applied to agricultural crops. The PestLCI Consensus v.1.0 tool presented herein helps estimating pesticide ewwmissions in agricultural processes to prepare inventories for life cycle assessment (LCA) studies. This important environmental management tool was improved to enable the incorporation of the potential impacts of these compounds on agricultural production systems. In addition, the present work also aimed to parameterize relevant agricultural production scenarios for Brazil. With this, it is expected to lead to the improvement of LCA studies that address the possible impacts of pesticides on human health and the environment. |
| Tipo: Documentos (INFOTECA-E) |
Palavras-chave: Avaliação do ciclo de vida; Agrotóxico; Pesticida; Impacto Ambiental; Águas Superficiais; Águas Subterrâneas; Solo; Ar; Pesticides; Environmental impact; Molecular dynamics; Groundwater; Surface water; Life cycle assessment; Air. |
| Ano: 2021 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1137347 |
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| MORAES,H.M.F.; COSTA,J.O.; PEREIRA,G.A.M.; SOUZA,W.M.; SILVA,A.A.; PAIXÃO,G.P.. |
| ABSTRACT: Available information on physical compatibility and stability of pesticide mixtures is scarce and often divergent. This knowledge is of fundamental importance in the success of pest, disease, and weed control programs. Compatibility and stability of two glyphosate formulations (WG and SL) in a mixture with fluazinam + deltamethrin + trifloxystrobin/cyproconazole at four diluted water concentrations and different times were evaluated under laboratory conditions. The evaluations were performed at the following time intervals: immediately after mixing and 1, 5, 10, 30, 120, 900, and 1,440 minutes after the mixing of pesticides. Scores were assigned on a scale ranging from 1 to 5, where 1 meant immediate separation of compounds and 5 the perfect... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pesticides; Formulation; Spraying. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100179 |
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| Redoan,Ana Carolina Maciel; Carvalho,Geraldo Andrade; Cruz,Ivan; Figueiredo,Maria de Lourdes Corrêa; Silva,Rafael Braga da. |
| Doru luteipes (SCUDDER, 1876) is considered one of the best natural enemies of the fall armyworm Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae), feeding on their eggs and small caterpillars. For its conservation it is necessary to use selective insecticides to S. frugiperda and harmless to the predator. Therefore, objective of the present work was to evaluate the toxicity of insecticides registered to control of S. frugiperda. It was conducted bioassays with D. luteipes adults treated with insecticides directly by exposure to residues of compounds applied on glass plates and the consumption of eggs of S. frugiperda contaminated and offered each one, 24 and 48 hours after treatment. The insecticides were classified according to indices... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Pest; Predator; Pesticides; Toxicity. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902013000400022 |
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| Petacci,F.; Tavares,W.S.; Freitas,S.S.; Teles,A.M.; Serrão,J.E.; Zanuncio,J.C. |
| Asteraceae weeds are rich in chemicals that have biological and pharmaceutical activities. The aims of this work were to describe the phytochemistry and quantify the polyphenols in ethanol extracts from leaves of 12 species of Asteraceae weeds collected in Diamantina, Minas Gerais State, Brazil. The screening of Asteraceae extracts revealed the presence of tannins, steroids, triterpenes, anthocyanins, and flavonoids. The total phenolic content was high in extracts of Lychnophora ericoides (147.97 ± 2.66), Lepidaploa lilacina (141.11 ± 1.99), and Eremanthus elaeagnus (134.61 ± 7.81) and low in extracts of Lychnophora ramosissima (32.65 ± 0.70), and Lychnophora sp. (54.03 ± 0.73). Extracts of Asteraceae weeds from Diamantina could have potential for... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Asteraceae; Campos rupestres; Diamantina; Pesticides; Phytochemistry; Polyphenols. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582012000100002 |
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| Gagnaire, Beatrice; Thomas Guyon, H; Burgeot, Thierry; Renault, Tristan. |
| The shellfish industry is an important economic activity in France, occurring mostly in estuarine zones subject to pollution due to anthropogenic activities. The harmful effects of pollutants on species inhabiting these estuarine zones are not well known. Among marine species, bivalve mollusks---particularly Pacific oyster, Crassostrea gigas-may serve a model of interest. The species is sedentary and filter-feeding, which favors bioaccumulation of pollutants in their tissues. Oysters may be suitable for studies on disturbance by pollutants of physiological activities, among which defense mechanisms are poorly documented in bivalves. In this study, effects of pollutants on hemocyte functions were monitored in Pacific oyster, C. gigas. Hemocytes were exposed... |
| Tipo: Text |
Palavras-chave: Toxicity; Pesticides; PCBs; PAHs; Crassostrea gigas; Pacific oyster; Hemocytes; Flow cytometry; Cellular activities. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1695.pdf |
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| MARCHI, G.; SILVA, C. A.; GUILHERME, L. R. G.; PIRES, A. M. M.; GUERREIRO, M. C.. |
| ABSTRACT: This work presents theory and applications in capillary electrophoresis. This technique is a powerful tool representing a large saving in chemicals (0.5 to 4 nL s-1 flux), samples (1 to 100 nL), and method development time. In addition, this work pictures applications such as separation and determination of analytical compounds. Recent reviews were cited to provide essential information for users regarding data sources, pioneer works, and theoretical treatments. The technique is reliable to study air, soil, and water samples in order to be able to determine trace amounts of pollutants. Examples of trace elements, pesticides, and humic substances analyses were showed. Separation and determination of proteins, peptides, aminoacids, nucleic acids,... |
| Tipo: Documentos (INFOTECA-E) |
Palavras-chave: Análise Química; Pesticida; Química do Solo.; Chemical composition; Pesticides; Soil chemistry.. |
| Ano: 2007 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/571969 |
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| Sharma, A; Battersby, N; Stewart, D. |
| The Minimal Inhibitory Concentration (MIC) of a biocide is usually determined by adding it in various concentrations to a suitable growth medium which is then inoculated with the test bacterium. These cultures are then observed for up to 28 days for growth of the organism as shown by its production of black ferrous sulphide. A method has been developed whereby the MIC of a biocide can be found within 4 days. Instead of noting ferrous sulphide production, this new method measures changes in: 1) optical density and 2) sulphate reduction of a logarithmic culture of the test strain exposed to the biocide. |
| Tipo: Text |
Palavras-chave: Bacteria; Microorganisms; Pesticides; Analytical techniques; Sulfate reduction. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/acte-1016.pdf |
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| Souza,Tamara D. de; Borges,Alisson C.; Matos,Antonio T. de; Mounteer,Ann H.; Queiroz,Maria E. L. R. de. |
| ABSTRACT The objective of this study was to evaluate the remediation of water containing the insecticide chlorpyrifos by using constructed wetlands (CW) cultivated with Polygonum punctatum, Cynodon spp. and Mentha aquatica, operated under different hydraulic retention times: 24, 48, 96, 144 and 192 h. The system efficiency was based on reduction of the initial concentration of chlorpyrifos and toxicity of the contaminated water. The results showed that constructed wetlands are an excellent alternative for remediation of the insecticide chlorpyrifos in aqueous medium. It was observed that the average overall removal efficiency of the insecticide was 98.6%, and in the first hydraulic retention time, 24 h, chlorpyrifos was removed to levels below the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bioremediation; Phytoremediation; Organophosphate; Pesticides; Toxicity. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001200878 |
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| Costa,Denilson Bezerra; Souza,Brígida; Carvalho,Geraldo Andrade; Carvalho,César Freire. |
| ABSTRACT - This work was designed to evaluate the residual action of the insecticides trichlorfon, triflumuron, endosulfan, fenpropathrin, chlorpirifos, tebufenozide and esfenvalerate, sprayed on cotton plants, to second-instar larvae of Chrysoperla externa (Hagen, 1861), under greenhouse conditions. The experimental design was completely randomized with ten replicates. Three larvae were released on each plant, in the 1st, 12th and 23rd day after pesticides spray. Tebufenozide and esfenvalerate were little persistent (class one), while trichlorfon, triflumuron and endosulfan were slightly persistent, decreasing the survival of C. externa larvae over 30%, up to 14 days after spray. Fenpropathrin and chlorpirifos caused mortality over 30%, up to 25 days... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Selectivity; Predator; Pesticides; Cotton. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542003000400014 |
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| Registros recuperados: 154 | |
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