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2,4-D Hormesis Effect on Soybean Planta Daninha
SILVA,J.R.O.; MARQUES,J.N.R.; GODOY,C.V.C.; BATISTA,L.B.; SILVA,A.A.; RONCHI,C.P..
ABSTRACT: The hormesis effect of 2,4-D, applied at two stages of soybean development, on the physiological components of crop yield, was investigated. Soybean seeds of the cultivar ‘AG 3680 IPRO’ were sown in pots containing 7 L of a substrate and kept in a greenhouse. A randomized complete block design with four replicates was used. Eighteen treatments were tested, arranged in a split-plot scheme. The plots consisted of two stages of herbicide application (V4 and V6), and the split-plots were arranged by nine 2,4-D doses (0, 5, 10, 15, 20, 25, 30, 40, and 50 g ha-1). At the time of harvest, 100 days after sowing, significant interactions between crop development stages and 2,4-D doses were observed for the number of nodes in the main stem (NNMS) and the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Glycine max; Auxin; Herbicide.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100154
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A mathematical model to estimate the volume of grey water of pesticide mixtures. Repositório Alice
PARAIBA, L. C.; PAZIANOTTO, R. A. A.; LUIZ, A. J. B.; MAIA, A. de H. N.; JONSSON, C. M..
Abstract: We propose a model to estimate the grey water footprint of crops by calculating the volume of water necessary to dilute pesticide mixtures reaching freshwaters. The model requires short-term toxicity data from aquatic organisms based on EC50 values, soil pesticide half-life and soil sorption coefficient values, and does not require maximum concentration limit acceptable in water. The lixiviation rate and runoff rate of each pesticide was estimated by attenuation factor and by Soilfug model, respectively. The usefulness of the proposed model was illustrated by estimating the volume of grey water required to dilute the 17 most widely used herbicides in sugarcane crops of Brazil. The grey water footprint corresponding to the recommended agronomic...
Tipo: Separatas Palavras-chave: Herbicide; Cana-de-açúcar.; Agrotóxico; Herbicida; Modelo matemático; Qualidade da água.; Environmental impact; Herbicides; Mathematical models; Water quality; Sugarcane; Toxicity; Water footprint..
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1007175
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A Modified phosphate-carrier protein theory is proposed as a non-target site mechanism For glyphosate resistance in weeds Planta Daninha
Roso,A.C.; Vidal,R.A..
Glyphosate is an herbicide that inhibits the enzyme 5-enolpyruvyl-shikimate-3-phosphate synthase (EPSPs) (EC 2.5.1.19). EPSPs is the sixth enzyme of the shikimate pathway, by which plants synthesize the aromatic amino acids phenylalanine, tyrosine, and tryptophan and many compounds used in secondary metabolism pathways. About fifteen years ago it was hypothesized that it was unlikely weeds would evolve resistance to this herbicide because of the limited degree of glyphosate metabolism observed in plants, the low resistance level attained to EPSPs gene overexpression, and because of the lower fitness in plants with an altered EPSPs enzyme. However, today 20 weed species have been described with glyphosate resistant biotypes that are found in all five...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Membrane carrier proteins; Herbicide; Weed resistance.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582010000500025
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Adoption of Best Management Practices to Control Weed Resistance By Cotton, Corn, and Soybean Growers AgEcon
Frisvold, George B.; Hurley, Terrance M.; Mitchell, Paul D..
This study examined adoption of ten best management practices (BMPs) to control weed resistance to herbicides. Using data from a survey of 1,205 U.S. cotton, corn, and soybean growers, count data models were estimated to explain the total number of practices frequently adopted. Ordered probit regressions were used to explain the frequency of individual BMP adoption. Growers practicing a greater number of BMPs frequently (a) had more education, but less farming experience; (b) grew cotton, (c) expected higher yields relative to the county average; and (d) farmed in counties with a lower coefficient of variation (CV) for yield of their primary crop. Yield expectations and variability were significant predictors of the frequency of adoption of individual...
Tipo: Conference Paper or Presentation Palavras-chave: Weeds; Herbicide; Resistance management; Corn; Cotton; Soybeans; Adoption; Crop Production/Industries; Farm Management; Production Economics; Research and Development/Tech Change/Emerging Technologies; Q12; Q16.
Ano: 2009 URL: http://purl.umn.edu/49432
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Adsorption of glyphosate in chilean soils and its relationship with unoccupied phosphate binding sites PAB
Kogan,Marcelo; Metz,Alejandra; Ortega,Rodrigo.
The objective of this work was to investigate glyphosate adsorption by soils and its relationship with unoccupied binding sites for phosphate adsorption. Soil samples of three Chilean soils series - Valdivia (Andisol), Clarillo (Inceptisol) and Chicureo (Vertisol) - were incubated with different herbicide concentrations. Glyphosate remaining in solution was determined by adjusting a HPLC method with a UV detector. Experimental maximum adsorption capacity were 15,000, 14,300 and 4,700 mg g¹ for Valdivia, Clarillo, and Chicureo soils, respectively. Linear, Freundlich, and Langmuir models were used to describe glyphosate adsorption. Isotherms describing glyphosate adsorption differed among soils. Maximum adjusted adsorption capacity with the Langmuir model...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Herbicide; Dosage effects; Models.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2003000400010
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AGGREGATION ISSUES IN PEST CONTROL ECONOMICS: A BIOECONOMIC APPROACH AgEcon
Young, Douglas L.; Smith, Elwin G.; Kwon, Tae-Jin.
Previous research has defined “aggregate pesticide expenditures” as the control variable; however, virtually all managerial recommendations and environmental restrictions target specific pesticides, rates, and crops. A bioeconomic approach considering particular pesticides on specific pests and crops is recommended for managerial-policy applications and testing for increasing returns. Exponential weed control and seven popular yield damage functional forms were estimated for a bioeconomic weed control model for winter wheat in Washington. Concavity with respect to herbicide rate was observed for most popular damage functions at normal weed densities and manufacturers’ label rates, but convexity existed outside these ranges and should be checked.
Tipo: Conference Paper or Presentation Palavras-chave: Bioeconomic; Data aggregation; Herbicide; Increasing returns; Pest control; Pesticide; Weed; Crop Production/Industries.
Ano: 2000 URL: http://purl.umn.edu/36448
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Agriculture-induced water quality problems in a maize irrigated crop: 2 - atrazine leaching. Repositório Alice
ANDRADE, C. de L. T. de; ALVARENGA, R. C.; KARAM, D.; BORGES JUNIOR, J. C. F..
Tipo: Parte de livro Palavras-chave: Herbicide; Water contamination.; Herbicida; Corn; Irrigation..
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/490777
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Allelopathic Effects of Different Plant Water Extracts on Yield and Weeds of Wheat Planta Daninha
NAEEM,M.; CHEEMA,Z.A.; IHSAN,M.Z.; HUSSAIN,Y.; MAZARI,A.; ABBAS,H.T..
ABSTRACT: Use of synthetic herbicides to control weeds poses serious threats to sustainable agricultural production around the globe. The phytotoxic effect of different plant water extracts (i.e., sorghum, sunflower and mulberry) against weeds has been previously studied; however, their combined effects at different rates are yet to be explored. In this study, mixtures of allelopathic water extracts of sorghum + sunflower and sorghum + sunflower + mulberry were sprayed each at 12, 15, 18 and 21 L ha-1 at 40 and 55 days after sowing in wheat to control wild oats (Avena fatua), little seed canary grass (Phalaris minor), lamb’s quarters (Chenopodium album) and swine cress (Coronopus didymus). A synthetic herbicide Affinity 50 WP (Carfentrazone-ethyl 0.75% +...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Herbicide; Weed management; Allelopathy.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100299
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Allelopathic effects of Eucalyptus citriodora on amaryllis and associated grassy weed Planta Daninha
El-Rokiek,K.G; Eid,R.A.
A Petri dish assay was carried out for screening different concentrations of aqueous extracts of fresh and dry leaves of Eucalyptus citriodora on germination and seedling growth of wild oat weed (Avena fatua). Seed germination, root and shoot length of wild oat exhibited different degrees of inhibition according to the concentration of the aqueous extract. Maximum inhibitions of germination percentage, root and shoot length were recorded when using 25% fresh leaf extract. Based on this preliminary work (Petri dish assay), studies were conducted under greenhouse conditions at the National Research Center, Egypt, in the two winter seasons of 2006/2007 and 2007/2008 to evaluate the effects of foliar and soil treatments of aqueous extracts of Eucalyptus...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aqueous extract; Herbicide; Phytotoxic; Total phenols; Tralkoxydim.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582009000500002
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Ametryn Leaching in Soils from the Sugarcane Region in Northeastern Brazilian Planta Daninha
SILVA,K.S.; FREITAS,F.C.L.; BRAGA,D.F.; DOMBROSKI,J.L.D.; SANTOS,A.F.B..
ABSTRACT Ametryn is one of the most widely used herbicides in the sugarcane culture. Little is known about the interactions between this herbicide and the attributes of soils in the sugarcane region of northeastern Brazil. This knowledge, before recommending herbicide, will minimize the negative effects on the environment, particularly on water resources, and will ensure weed control efficacy. In this work, ametryn leaching potential was estimated through bioassays and chromatography, in five soils from the sugarcane region in northeastern Brazil: Quartzarenic Neosol (Entisol); Red Argisol (Ultisol); Ferrihumiluvic Spodosol (Spodosols); Red-Yellow Acrisol (Oxisol) and Haplic Cambisol (Inceptisols). To achieve this, columns were prepared with samples of the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Herbicide; Liquid chromatography; Bioassay; Mobility.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000400839
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Análise econômica da aplicação de herbicidas na cultura da pimenta-do-reino no município de Altamira, PA. Infoteca-e
CARVALHO, R. de A.; HOEFLICH, V. A.; VIEIRA, G.; REIS, R. P..
bitstream/item/57561/1/Belem-Doc15.pdf
Tipo: Documentos (INFOTECA-E) Palavras-chave: Pimenta-do-reino; Controle; Altamira; Pará; Brasil; Black papper; Herbicide; Economy; Yield; Production; Control; Weed.; Economia; Erva Daninha; Herbicida; Piper Nigrum; Produtividade; Produção.; Amazonia..
Ano: 1989 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/379307
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Aplicação de herbicidas em faixa na cultura do milho (Zea mays L.). Repositório Alice
SILVA, J. B.; PASSINI, T..
Tipo: Parte de livro Palavras-chave: Aplicacao; Maize; Herbicide; Application.; Herbicida; Milho; Zea Mays..
Ano: 1984 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/476170
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Application of Sulfentrazone in Stages of Germination of IAC 90 Cassava Cuttings in Clay Soils and Sandy Planta Daninha
Zimmer,J.S.; Ferreira,S.D.; Ramella,J.R.; Rodrigues-Costa,A.C.P.; Costa,N.V..
Weeds interfere dramatically in the productive potential of cassava; however, information regarding herbicides that are selective to crops is still scarce. Thus, the aim in this study was to assess the initial growth of IAC 90 cassava plants after the application of sulfentrazone at different stages of germination of cassava in clayey and sandy soils. Three experiments were simultaneously deployed: the first experiment consisted in the application of sulfentrazone in the non-germinated stage of cassava cuttings; the second one in the stage of germinated cassavas cuttings (0.9 cm shoots); and the third one in applications in the stage of cassava cuttings with buds emerging (6.5 cm shoots and emerging from the soil). For each experiment the experimental...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Herbicide; Manihot esculenta; Protox inhibitor; Selectivity.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000200305
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Association of chemical and mechanical weed control methods during the pre-harvest of coffee crops Planta Daninha
P. Ronchi,Cláudio.
Abstract Background: Weed control in the pre-harvest of the coffee crop is essential to enable mechanized coffee harvesting. Objective: Testing the efficacy of pre-emergent herbicides, applied after brush shredder or desiccation operations, on the weed control during the coffee crop’s pre-harvest. Methods: Two separate trials were accomplished in commercial Coffea arabica crops in the Cerrado Mineiro Region. In the first one, oxyfluorfen and sulfentrazone were applied after either brush shredder or burndown operation; in the second, they were tested as a tank mixture with glyphosate. Results: In the first assay, the brush shredder use, associated to the rains that follow, stimulated a sharp weed infestation during the pre-harvest, which was not...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coffea arabica; Burndown; Herbicide; Integrated weed management.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100329
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Atividade da acetolactato sintase em milho e populações de amendoim-bravo contrastantes em resistência ao imazaquin. Repositório Alice
OLIVEIRA, M. F.; PRATES, H. P.; BRIGHENTI, A. M.; GAZZIERO, D. L. P.; VARGAS, L.; OLIVEIRA JUNIOR, R. S.; VIDAL, R. A.; PURCINO, A. A. C..
Tipo: Parte de livro Palavras-chave: Maize; Herbicide; Resistance.; Amendoim Bravo; Euphorbia Heterophylla; Herbicida; Milho; Resistência; Zea Mays..
Ano: 2000 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/484461
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Atrazine and Mesotrione-Induced Oxidative Stress and Impact on Antioxidant Enzymes and Chlorophyll Contents in Bermudagrass Planta Daninha
WANG,Y.; YU,J.; ZHOU,B.; SAPKOTA,S.; WEI,F.; WANG,Z..
ABSTRACT: The effect of atrazine, mesotrione, and joint activity of atrazine plus mesotrione on pigment, lipid peroxidation, and antioxidant enzyme activity was studied. Atrazine and mesotrione treatments significantly reduced chlorophyll a (Chl a), chlorophyll b (Chl b), carotenoid concentrations, and protein content in bermudagrass (Cynodon dactylon L.) plants, whereas they significantly enhanced lipid peroxidation. The treatment of atrazine plus mesotrione caused greater phototoxic effect on bermudagrass than either herbicide alone, which was evident from the significantly decreased membrane stability noted as a function of the enhanced singlet oxygen and malondialdehyde (MDA) contents, as well as from the greater reduction in Chl a, Chl b, and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidant; Carotenoids; Herbicide; Reactive oxygen species.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100337
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Atrazine bound residues formation and dissipation in subtropical soil under swine wastewater application REA
Gonçalves,Morgana S.; Sampaio,Silvio C.; Coelho,Silvia R. M.; Suszek,Floriano L.; Cordovil,Claudia M. D. S..
The effects of swine wastewater on atrazine dissipation and formation of bound residues in subtropical clay soil were investigated in this study. The experiment was carried out in laboratory, under room conditions, where samples of Rhodic Hapludox soil received 168.61 mg kg-1 of atrazine and were incubated for 60 days in the following treatments: T1 (sterilized soil + swine wastewater), T2 (sterilized soil + distilled water), T3 (Non sterilized soil + swine wastewater) and T4 (Non sterilized soil + distilled water). The extractable residues and bound residues of atrazine were extracted and analyzed by high performance liquid chromatography. The results showed no effect of swine wastewater on atrazine dissipation. However, the addition of swine wastewater...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Herbicide; Degradation; Sorption; Organic matter.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000600017
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Atrazine in a corn cultivated area and its relation with the landscape position Ciência e Agrotecnologia
Aquino,Regimeire Freitas; Lima,José Maria de; Magalhães,Ciro Augusto de Souza; Silva,Bruno Montoani; Carvalho,Renato Fráguas de; Guilherme,Luiz Roberto Guimarães.
Atrazine is still being used in no-till corn production in Brazil. This herbicide can be moved by overland flow and leached in the soil profile. In both ways, it can pollute water, either by reaching the groundwater or lakes and streams close to the crop field. This study evaluated the presence of atrazine in a dystrophic Yellow-Red Argisol and a dystrophic Melanic Gleisol in a corn field, where atrazine has been applied for 11 years. Overland flow was the main process of atrazine transport on hillslope and leaching was the most important process in the floodplain. Frequency and location of atrazine application in the landscape define this herbicide contamination process.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Herbicide; Overland flow; Maize.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542013000500001
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Atrazine movement in a dark red latosol of the tropics Scientia Agricola
Souza,M.D. de; Basssoi,L.H.; Bacchi,O.O.S.; Reichardt,K.; Hermes,L.C.; Abakerli,R.B.; Pilotto,J.E..
Atrazine displacement was studied in a soil profile as a function of water movement and time after herbicide application, taking into account possible influence of preferential flow on leaching. The experiment consisted of two 7 x 7m plots of a dark red latosol (Kanduidalfic Eutrudox), located at Piracicaba, SP, Brazil (22º 43'S and 47º 25'W), 250km inside continent, at an altitude of 580m. One plot was previously treated with 1,000 kg/ha of lime, in order to increase base saturation to 88%, and 500kg/ha of gypsum. Each plot was instrumented with tensiometers, neutron probe access tubes and soil solution extractors, in order to monitor water and atrazine flows. Atrazine was applied at the high rate of 6 kg/ha of active principle. Results showed intensive...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Atrazine; Leaching; Preferential flow; Adsorption; Herbicide; Tropical soil.
Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300013
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Atrazine Reduces the Critical Period of Weed Interference on Narrow Row Corn Planta Daninha
PADILHA,M.; BARROSO,A.A.M.; CARVALHO,L.B.; COSTA,F.R.; BIANCO,S..
ABSTRACT The objective was to determine whether a change occurs in the critical period of weed interference prevention in narrow row corn with the use of atrazine and whether there is influence of the herbicide on crop yield components. The treatments consisted of periods without or with an initial weed control (0, 21, 35, 49, 63, 77, and 91 days after emergence), with or without application of atrazine in spikely post-emergence. The experiment was carried out in a 2 x 7 randomized blocks design (with and without weed control and seven periods with three replications). The use or not of atrazine was arranged in a split plot design. The most important weed species were Senecio brasiliensis, Urochloa plantaginea, Conyza bonariensis, Sida rhombifolia, and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Herbicide; Period of coexistence; Zea mays.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000400721
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