|
|
|
| Registros recuperados: 26 | |
|
|
| 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 |
| |
|
|
| 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 |
| |
|
| |
|
|
| BARCELLOS JÚNIOR,L.H.; PEREIRA,G.A.M.; GONÇALVES,V.A.; MATOS,C.C.; SILVA,A.A.. |
| ABSTRACT Weed control is one of the most relevant costs of sugarcane production. If weeds are not controlled at the right time, the productivity and longevity of sugarcane plantations are reduced. In this crop, chemical control is the most used method, since it is efficient and it has a lower cost. Differentiated tolerance of sugarcane cultivars to the herbicide clomazone has been observed in the fields. However, there is no scientific evidence of this effect on the productivity of crops. This study evaluated the effects of clomazone on three sugarcane cultivars (RB966928, RB93579 and RB867515). Herbicide application was performed 40 days after the emergence of sugarcane plants and 7, 14, 21 and 28 days after the application, the toxicity caused by the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Selectivity; Saccharum spp.; Herbicide. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100267 |
| |
|
|
| TIRONI,S.P.; GALON,L.; SILVA,A.A.; BARBOSA,M.H.P.; SILVA,A.F.; FERREIRA,E.A.. |
| ABSTRACT Weed management in sugarcane fields must be performed rationally, taking into consideration the competitive ability of cultivars and weeds, to allow for reductions in control costs and herbicide use. In this study, an evaluation was made of the interference of populations of Brachiaria brizantha in sugarcane cultivars, with the objective of estimating the economic threshold level of B. brizantha in competition with the cultivars RB72454, RB867515 and SP801816. For this purpose, an experiment was conducted under field conditions, where the cultivars coexisted with different weed densities. Considering the average values of the variables used for calculations, an economic threshold level was achieved with a population of 0.33, 0.46 and 0.66 plants... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brachiaria brizantha; RB72454; RB867515 SP801816; Saccharum spp. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000400649 |
| |
|
| |
|
|
| TEIXEIRA,M.F.F.; SILVA,A.A.; NASCIMENTO,M.A.; VIEIRA,L.S.; TEIXEIRA,T.P.M; SOUZA,M.F.. |
| ABSTRACT: Tebuthiuron is one of the most widely used herbicides in the sugarcane culture and its characteristic is the long persistence in soil. When used without knowing its interactions with soil attributes, it can reduce the sustainability of cropping systems and contaminate surface and groundwaters. In this research, by using a high-performance liquid chromatography, the effects of adding organic matter in a Red-Yellow Latosol were evaluated, as for the sorption and desorption of tebuthiuron. It was concluded that there is a direct relation between the sorption of tebuthiuron and the organic matter content in Red-Yellow Latosols and there is an inverse relation for desorption. The hysteresis index was lower in samples with high organic matter content. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chromatography; Hysteresis index; Persistence. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100283 |
| |
|
|
| LANGARO,A.C.; BARROS,J.P.A.; SOUZA,M.F.; SILVA,E.M.G.; SILVA,A.A.. |
| ABSTRACT: As an alternative to control of resistant biotypes, farmers have resorted to the use of herbicides that have residual soil activity and good pre-emergence action. One of the most used mixtures in Brazil is that of sulfentrazone + glyphosate. When a herbicide has a pre-emergence action, small leaching of its molecules is necessary for its superficial incorporation into the soil, where most of the weed seeds are found. However, if excessive leaching occurs, the herbicide may have reduced efficiency in controlling weed, increasing the risks of groundwater contamination. In this study, sulfentrazone leaching was evaluated in columns with soil, in isolated applications and in mixture with formulations of glyphosate (Roundup Ready®, Roundup Ultra® and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbicide; Environmental impact; Soil; Bioassay. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100217 |
| |
|
|
| SILVA,D.V.; FREITAS,M.A.M.; SOUZA,M.F.; QUEIROZ,G.P.; MELO,C.A.D.; SILVA,A.A.; FERREIRA,L.R.; REIS,M.R.. |
| The success of the intercropping among cultivated species depends on the adoption of practices that provide, in due course, greater competitive ability of a species over another. The objective of this study was to evaluate the use of glyphosate herbicide in the suppression of Brachiaria (signalgrass) intercropped with maize. The experiment was conducted in a randomized complete block design with four replications. The treatments were arranged in a 5 x 2 + 2 factorial arrangement, the first factor corresponding to the doses of glyphosate (48, 96, 144, 240, 480 g ha-1 of the acid equivalent (a.e)) and the second one to the vegetative stages of the signalgrass at the time of application (2 and 4 tillers). Two controls were added to the treatment list,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Urochloa brizantha; Crop-livestock integration. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000100133 |
| |
|
| |
|
|
| PEREIRA,J.L.; LOPES,M.C.; PARISH,J.B.; SILVA,A.A.; PICANÇO,M.C.. |
| ABSTRACT: The cultivation of transgenic soybean plants using the glyphosate resistant gene (RR soybeans), takes up about 47% of the world’s cropping area. Despite the large area planted with soybeans resistant to glyphosate, there are very few studies of the environmental impact of this technology, especially in tropical areas. Thus, this study aimed to evaluate the impact of the cultive of RR soybeans and the use of glyphosate on the community of soil surface arthropods. The experiment was conducted in Coimbra, Minas Gerais state for two agricultural years. The experimental design was conducted in randomized blocks with five replications. The treatments were: non-transgenic soybean with mechanical weeding; RR soybean with mechanical weeding; RR soybean... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Insect pests; Natural enemies and detritivorous. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100270 |
| |
|
|
| MADALÃO,J.C.; SILVA,A.A.; FARIA,A.T.; SARAIVA,D.T.; PIRES,F.R.; JAKELAITIS,A.. |
| ABSTRACT: The objective of this work was to study the influence of adjuvants on leaching and persistence of sulfentrazone in a Red-Yellow Ultisol. The soil was stored in PVC columns of 10 cm diameter and 50 cm length. The treatments were composed of sulfentrazone mixed with six adjuvants (Adesil®, Break-Thru®, Assist®, Hoefix®, Fera® and Nortox® Vegetable Oil), a treatment with sulfentrazone without any adjuvant and a treatment without the herbicide. In the treatments with sulfentrazone, the herbicide was applied at a rate of 1.0 kg ha-1 at the top of the columns, and 12 hours after application, the columns were subjected to simulated rainfall (60 mm). To confirm leaching of sulfentrazone, soil samples were collected every 5 cm up to 50 cm in each column... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sorghum bicolor; Red-Yellow Ultisol; Phytotoxicity; Environmental contamination. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100285 |
| |
|
|
| FREITAS,M.A.M.; VALADÃO SILVA,D.V.; SOUZA,M.F.; SILVA,A.A.; SARAIVA,D.T.; FREITAS,M.M.; CECON,P.R.; FERREIRA,L.R.. |
| Competition between maize and signalgrass can economically cripple the intercropping by the reduced yield of maize and dry matter content of the forage. In seeking to define plant arrangements which make this system more efficient, this research was held with the objective of assessing the effects of interference of densities of signalgrass (Urochloa Brizantha) on nutrition and on maize grain yield. Two field experiments were conducted in a randomized block design with four replications. Treatments were arranged similarly in both experiments, in a 2 x 4 factorial design, the first factor being the dose of Nicosulfuron herbicide applied (0 and 8 g ha-1) and the second factor being the forage seeding rates (0, 2, 4 and 6 kg of seeds per hectare). The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nicosulfuron; Competition in intercropping; Cropping spacing. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000100049 |
| |
|
|
| FAUSTINO,L.A.; FREITAS,M.A.M.; PASSOS,A.B.R.J.; SARAIVA,D.T.; FARIA,A.T.; SILVA,A.A.; FERREIRA,L.R.. |
| RESUMO O conhecimento dos fatores que influenciam a lixiviação dos herbicidas no solo é fundamental para sua utilização de forma segura, do ponto de vista técnico e ambiental. Neste trabalho, avaliou-se a mobilidade do sulfentrazone em quatro solos provenientes de uma área de reflorestamento da região Sul do Brasil (Planossolo Háplico, Argissolo Vermelho, Cambissolo Húmico e Neossolo Regolítico) e um Latosso Vermelho-Amarelo da Zona da Mata de Minas Gerais. As amostras de solo foram coletadas na profundidade de 0-20 cm e caracterizadas física e quimicamente. Os substratos foram colocados em colunas e, posteriormente, aplicou-se, nos topos delas, 1,0 kg ha-1 do herbicida, seguido de uma chuva simulada de 60 mm. Após a drenagem da água, foram semeadas ao... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Degradação; Bioindicador; Matéria orgânica. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000400795 |
| |
|
|
| SOUZA,M.F.; C. NETO,M.D.; MARINHO,M.I.; SARAIVA,D.T.; FARIA,A.T.; SILVA,A.A.; SILVA,D.V.. |
| ABSTRACT The commercial mixture of imazethapyr and imazapic herbicides has been used for the control of red rice and several other species of weeds found in rice crops; this system called Clearfield. However, its use may limit the succession of non-tolerant crops for long residual activity. The research objective with this work was to determine the persistence of imazethapyr, imazapic and their mixture in three soils in the Brazilian state of Tocantins. Three experiments were conducted in a completely randomized design with four replications, each corresponding to the evaluated soil (Haplic Plinthosol (FX), red-yellow Latosol (LVA) and Haplic Gleysol (GX)). The treatments were arranged in a split plot design, with the allocated plots herbicides... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carryover; Imazapic; Imazethapyr; Only(r). |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000300589 |
| |
|
|
| 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 |
| |
|
|
| RODRIGUES,D.A.; PEREIRA,G.A.M.; SILVA,A.A.; SANTOS,M.H.; DEMUNER,A.J.; OLIVEIRA,P.M.. |
| ABSTRACT: The great diversity of plant species in pastures of the Brazilian Cerrado with distinct ecophysiological characteristics indicates the possibility of finding, in the cellular content of this flora, chemical compounds with potential for use in agriculture and human and animal health. Three steps are necessary to prove this hypothesis: phytochemical prospecting, characterization of secondary metabolites, and studies on the biological activities of these metabolites present in these plants. The chemical profile of secondary metabolites present in five species of the Brazilian Cerrado (Davilla elliptica, Remijia ferruginea, Luehea paniculata, Anacardium occidentale, and Acosmium dasycarpum) was traced in this research. These plant species were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Secondary metabolites; Davilla elliptica; Remijia ferruginea; Luehea paniculata; Anacardium occidentale; Acosmium dasycarpum; Weed; Allelopathy. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100227 |
| |
|
|
| FARIA,A.T.; SILVA,E.M.G.; PEREIRA,G.A.M.; SOUZA,M.F.; SILVA,A.A.; REIS,M.R.. |
| ABSTRACT: Studies on herbicide behavior in soils may be performed using biological and chemical methods. The efficiency of the biological method depends on the indicator species sensitivity to low herbicide concentrations in the soil solution. Among the herbicides commonly used in Brazil for corn cultivation, tembotrione stands out. In the last agricultural seasons, the intoxication of some crops when cultivated in succession to corn has been reported, which may be attributed to tembotrione recommendations without the knowledge of their interactions with colloids of tropical soils. In this research, we selected an indicator plant species of tembotrione residues in the soil after sorting 12 species. The sorption of this herbicide was estimated in two... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bioassay; Environmental impact; Herbicides; Technical efficiency. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100327 |
| |
|
|
| 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 |
| |
| Registros recuperados: 26 | |
|
|
|
