|
|
|
| Registros recuperados: 136 | |
|
| |
|
| |
|
|
| CARNEIRO,G.D.O. PESSOA; SILVA,G.S.; BARBOSA,A.R.; SILVA,D.V.; REIS,M.R.. |
| ABSTRACT The initial slow growth and short stature of carrot can allow that weeds settle in crop areas, requiring the management of these plants for productivity not to decrease. Nevertheless, weeds control has been difficult because there are few herbicides available for weeds control in postemergence of carrots. Two experiments in the field were carried out to evaluate selectivity of metribuzin applied in postemergence of carrots. A experimental randomized block design was utilized with four repetitions. Treatments consisted of metribuzin doses (0, 144, 288, 432, 576, 720, 960 and 1,200 g ha-1), applied in postemergence of carrots of the Nantes variety. Roots productivity was evaluated and percentage of commercial roots and no-commercial roots was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Daucus carota; Chemical control; Herbicide. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100240 |
| |
|
|
| A. Matos,Ana K.; Carbonari,Caio A.; F.S. Brito,Ivana P.; L.G.C. Gomes,Giovanna; B. Trindade,Maria L.; D. Velini,Edivaldo. |
| Abstract Background: The use of commercial mix and tank mix with two or more herbicides is a widespread practice. However, despite its several possible benefits, little is known about its effect on the behavior of the molecules in the soil, which can increase or reduce the leaching potential of these molecules. Objective: This study evaluated the leaching potential of the herbicides diuron and sulfentrazone applied, using commercial mix and tank mix, in soils with different textures. Methods: The herbicides diuron (1,750 g ha-1) and sulfentrazone (875 g ha-1) were applied in three soils with different textures (clayey, medium, and sandy), using a commercial mix (Stone®) and a tank mix (Herburon 500 BR + Boral®). Subsequently, the treated soils were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbicide; Leaching; Commercial mix; Tank mix. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100318 |
| |
|
|
| SCHMITZ,M.F.; ZANDONÁ,R.R.; VARGAS,A.A.M.; GARCIA,J.R.; TUNES,L.V.M.; AGOSTINETTO,D.. |
| ABSTRACT: The commercialization of ryegrass seeds with the presence of resistant biotypes is a serious issue that increses the dispersion of resistance to new areas without this problem. Therefore, this study aimed to develop a quick test to detect susceptible and resistant seeds to the glyphosate herbicide in order to identify contaminated seed lots with glyphosate resistance. Three experiments were carried out, one in greenhouse and the other two in the seed laboratory. First, the resistance factor (RF) was determined by a dose-response curve experiment in biotypes suspected to be resistant and susceptible to glyphosate. Then, the germination test was conducted with the selected biotypes under increasing glyphosate rates (0, 3.5, 6.9, 13.9, 27.8, 55.5,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lolium multiflorum; Germination; Herbicide; Methodology. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100243 |
| |
|
|
| SOUSA,G.V.; PEREIRA,G.A.M.; TEIXEIRA,M.F.F.; FARIA,A.T.; PAIVA,M.C.G.; SILVA,A.A.. |
| ABSTRACT: In Brazil, sugarcane is grown in large areas. Weed control in sugarcane fields is done by chemical method, since it is more efficient and less expensive. In this method, herbicides that persist in the environment for long periods are used, among which there are hexazinone and diuron, which are applied in mixtures marketed by the industry. This research evaluated the sorption and desorption of hexazinone and diuron applied alone and in mixture, in two samples of Red-Yellow Latosols (LVAG and LVAV) and a Organosol (OR), with and without manure. Sorption isotherms were built using the batch equilibrium method and the identification and quantification of herbicides was obtained through a high-performance liquid chromatography (HPLC) with UV-Vis... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbicide; Behavior in soil; Environmental impact. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100293 |
| |
|
|
| FARIA,A.T.; FIALHO,C.A.; SOUZA,M.F.; FREITAS,N.M.; SILVA,A.A.. |
| ABSTRACT: Tembotrione is registered in Brazil for maize and is used in large areas of the country in each harvest. In recent years, producers have reported carryover effects of this herbicide in succeeding crops to maize. This fact can be attributed to tembotrione recommendations without knowing their interactions with tropical soils colloids. In this study, using high-performance liquid chromatography, it was possible to evaluate the influence of chemical and physical attributes on the sorption and desorption of tembotrione, as well as its metabolite AE 1417268, on seven soils from different regions of Brazil. The coefficients referring to sorption and desorption, as well as the hysteresis index (Kf, 1/n and H) of tembotrione and its metabolite were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbicide; Sorption coefficient (Kf); Hysteresis; Environmental impact. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100293 |
| |
|
|
| 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 |
| |
|
|
| Silva,M.A.; Arantes,M.T.; Oliver,R.; Brunelli,M.C.. |
| This study aimed to evaluate the tolerance of sugarcane cultivars to ratoon eradication under different glyphosate rates by means of physiological responses. Therefore, a trial was carried out in randomized complete blocks with 4 x 4 factorial design (cultivars x rates) totaling 16 treatments with four replicates. The cultivars IAC91-5155, IACSP93-3046, and IAC86-2480 and IAC87-3396 and the glyphosate rates 0 g ha-1; 1,920 g ha-1; 2,400 g ha-1; 2,880 g ha-1 were tested. The variables analyzed were percentage of tiller mortality, quantum efficiency of PSII (Fv/Fm) and SPAD index. The results showed that there are differences among sugarcane cultivars for tiller eradication and for physiological responses with glyphosate different rates. The rate of 2,880 g... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum spp.; Varieties; Tillers; Chlorophyll fluorescence; SPAD; Herbicide. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000100023 |
| |
|
|
| Bundt,A.C.; Avila,L.A.; Pivetta,A.; Agostinetto,D.; Dick,D.P.; Burauel,P.. |
| Accelerated herbicide degradation consists in its faster degradation in areas where it has been previously applied, due to the adaptation of microbial population to that particular compound. Accelerated degradation can reduce herbicide persistence and reduce its efficacy in soil. The objective of this study was to investigate if imidazolinone herbicides have enhanced microbial degradation in rice paddy soils. A laboratory experiment was conducted, evaluating the CO2 evolution rate from soils with and without history of herbicide application (imazapyr + imazapic and imazethapyr + imazapic), incubated with imidazolinone herbicides: imazethapyr, imazapyr, imazapic, imazamethabenz, imazamox and an untreated check. The amount of CO2 released from the soil was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Residual effect; Herbicide; Microbial activity; Oryza sativa. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000200341 |
| |
|
|
| DIESEL,F.; TREZZI,M.M.; GALLON,M.; BALBINOT JR.,A.A.; PAGNONCELLI,F.B.. |
| ABSTRACT: Infesting species of Rubiaceae family have great importance in soybean crops in Southwest of Paraná and North of Santa Catarina, especially due to the selection of tolerant populations caused by the pressure of selection exerted by intensive use of glyphosate. The study aimed to evaluate the levels of tolerance to glyphosate in biotypes of broadleaf buttonweed (Borreria latifolia) (BL) and white-eye (Richardia brasiliensis) (RB) by means of dose-response curves. Two experiments were conducted in a greenhouse, in completely randomized design (CRD), with four replications. Fourteen BL biotypes and eleven RB biotypes were evaluated, collected in soybean fields of Paraná and Santa Catarina. The doses of glyphosate were 0, 74, 163, 360, 792 and 1,742... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Borreria latifolia; Herbicide; Richardia brasiliensis; Selection. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100338 |
| |
|
|
| SANTOS JUNIOR,A.; TUFFI SANTOS,L. D.; FERREIRA,F. A.; FERREIRA,L. R.; FELIX,R. C.; AMARAL,G. C.; CRUZ,L. R.. |
| ABSTRACTWith the present study we aim to assess the damage caused to Eucalyptus plants exposed to glyphosate drift in different canopy portions. The drift simulation was carried out through application of 1,080 g ha-1 of glyphosate in five canopy portions (0, 25, 50, 75 and 100% of the low branches), in four areas of cultivation. Areas I and II, plants with 0.91 and 2.98 m, and height of canopy drift exposition of 0.30 and 1.0 m, respectively. In areas III and IV both cultivations were 8.15 m high, varying the height of drift exposition between 2.0 and 2.5 m, respectively. At 30 and 480 days after application (DAA), the survival rate was assessed, and at 300 and 480 DAA diameter at breast height (DBH), height, volume and their respective increment were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Wood production; Herbicide; Eucalyptus spp. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000300615 |
| |
|
|
| Albrecht,A.J.P.; Albrecht,L.P.; Krenchinski,F.H.; Placido,H.F.; Lorenzetti,J.B.; Victoria Filho,R.; Barroso,A.A.M.. |
| Recent studies indicate that glyphosate applied in post-emergence in RR soybean can eventually cause phytotoxic effects. However, there are many questions that need to be clarified in the scientific and technical contexts, involving the issue of RR soybeans regarding the use of glyphosate. This study has assessed the impact of the application of different doses and formulations of glyphosate in the reproductive period of RR soybean (R1 stage). For that purpose, an experiment in the field was conducted in two harvests (2011/12 and 2012/13), in which a 2 x 5 factorial design was used (formulations versus doses) totaling 10 treatments. In these two experiments the variables related to agronomic performance were: phytotoxicity (7, 14, 21 and 28 days after... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Herbicide; Transgenic crops; Phytotoxicity. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000400020 |
| |
|
|
| CARVALHO,A.R.J.; MAIA,V.M.; ASPIAZÚ,I.; PEGORARO,R.F.; OLIVEIRA,F.S. |
| ABSTRACT Diuron is a widely used herbicide on pineapple cultivations. However, its application is recommended only for the implementation of the crop. The objective of this work was to evaluate the gas exchanges of four pineapple cultivars submitted to the application of the herbicide diuron at their reproductive stage. The experiment was conducted with the IAC Fantástico, Vitória, MD2 and Pérola pineapple cultivars using the active ingredient diuron at a dose of 7.5 mL L-1. Measurements of CO2 assimilation rate, stomatal conductance, transpiration, vapor pressure deficit and water use efficiency were carried out weekly, by the hour, on two plants per cultivar, over a 24 hour period. These determinations were carried out two days before the application of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ananas comosus var. comosus; Herbicide; Gas exchange; Weeds; Chemical control. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100316 |
| |
|
|
| SILVA JR.,A.C.; GONÇALVES,C.G.; SCARANO,M.C.; PEREIRA,M.R.R.; MARTINS,D.. |
| ABSTRACT: The action of herbicides on weeds that develop under water deficit can be compromised, because the routes of penetration of hydrophilic herbicides are reduced due to the lower hydration of the cuticle in these plants. Moreover, hydrophobic compounds found in the epicuticular wax coating of plants under water stress, hinder the penetration of hydrophilic compounds. This study evaluated the control efficiency of glyphosate on guineagrass plants when submitted to different water deficits. The study was conducted in a greenhouse, and treatments were composed of guineagrass plants submitted to three soil water conditions [low water deficit (13%), intermediate water deficit (10%) and high water restriction (8%)], three doses of glyphosate (0.0, 270.0... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbicide; Water deficit; Weed; Panicum maximum. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100320 |
| |
|
|
| PEREIRA,G.A.M.; BARCELLOS JR.,L.H.; GONÇALVES,V.A.; SILVA,D.V.; SILVA,A.A.. |
| ABSTRACT The chemical control of weed is a necessary practice in large-scale agriculture. However, when herbicides are used in the wrong way, they can remain into soil for long periods and/or be leached in its profile, and they may even contaminate groundwater. In this research, clomazone leaching in soil samples collected from different Brazilian regions was estimated by biological method. To do so, columns containing soils were used, and samples were collected every 5 cm. After preparing columns and applying a 1,500 g a.i. ha-1 clomazone dose, rain simulation was performed. Sorghum was used in order to detect the herbicide. More than 60% similarity was found for the studied variables; it was chosen to use only data referring to toxicity percentage.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbicide; Mobility in soil; Environmental impact. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100225 |
| |
|
|
| MARTINS,D.A.; JAKELAITIS,A.; PEREIRA,L.S.; MOURA,L.M.F.; GUIMARÃES,K.C.. |
| ABSTRACT: Corn and forage intercropping system has been commonly used for pasture establishment or renewal. In addition, the use of reduced doses of herbicides selective to corn has facilitated coexistence by reducing competitiveness against forage species. This study aimed to evaluate the effects of mesotrione underdoses in a corn and Urochloa brizantha intercropping on weed population dynamics, corn yield, and forage performance and nutritional quality. For this purpose, five mesotrione doses were tested (0.0, 9.6, 19.2, 38.4, and 57.6 g ha-1) in corn and forage intercropping and monocultures. Individual density and weed dry matter were influenced by mesotrione doses, intercropping, and precipitation distribution over the evaluated period in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays L.; Competition; Herbicide; Crop-livestock integration; Weeds. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100255 |
| |
|
|
| MATTE,W.D.; CAVALIERI,S.D.; PEREIRA,C.S.; IKEDA,F.S.; COSTA,W.B.. |
| ABSTRACT: The application of alternative herbicides to replace glyphosate can affect the succession cropping due to the persistence in the soil. The aim of this work was to evaluate the residual activity of diclosulam applied to a pre-emergence soybean crop on a cotton plant grown in succession. The present study used a randomized complete block design with five replicates and seven doses of diclosulam (0, 2.19, 4.38, 8.75, 17.5, 35 and 70 g a.i. ha-1). The cotton was sown 112 days after application of the herbicide, with accumulated rainfall of 637 mm during the soybean cycle. Variables related to photosynthetic characteristics, phytointoxication, growth, components of production and productivity were evaluated in both crops. Diclosulam did not affect the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carryover; Glycine max; Gossypium hirsutum; Herbicide; Persistence. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100216 |
| |
|
|
| CORREIA,N.M.. |
| ABSTRACT The control of morning glory (Ipomoea spp. and Merremia aegyptia) was evaluated in five commercial sugarcane-production fields receiving applications of the herbicides sulfentrazone (0.9 kg ha-1), amicarbazone (1.4 kg ha-1), imazapic (0.147 kg ha-1), and hexazinone + tebuthiuron (0.325 + 0.75 kg ha-1) applied pre-emergence in either the dry season (July and August) or in the semi-wet season (early October); mesotrione alone (0.192 kg ha-1) or in combination (0.12 kg ha-1) with atrazine (1.5 kg ha-1) or diuron + hexazinone (0.491 + 0.139 kg ha-1) applied post-emergence in the wet season (November), and the phytointoxication of the chemical treatments for sugarcane. Five species of morning glory (Ipomoea hederifolia, Ipomoea nil, Ipomoea quamoclit,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbicide; Ipomoea spp.; Merremia aegyptia; Pre-emergence; Post-emergence; Saccharum spp. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000200333 |
| |
|
| |
| Registros recuperados: 136 | |
|
|
|
