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| Registros recuperados: 26 | |
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| 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 |
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| 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 |
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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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| SILVA,E.M.G.; FARIA,A.T.; MARULANDA,N.M.E.; PEREIRA,G.A.M.; SARAIVA,D.T.; REIS,M.R.; SILVA,A.A.. |
| ABSTRACT: Before recommending an herbicide, it is necessary to know its interactions with the soil attributes that will influence its sorption and half-life in the soil. This knowledge is an essential condition for minimizing any negative effects that may result from its application. However, due to the great diversity of soil and climate in Brazil, especially for products of recent use in the country, such as the herbicide tembotrione, this knowledge is often not available. This may be the main cause of occurrence of intoxication reports in crops carried out in succession to corn sprayed with this herbicide. In order to reduce possible impacts on successor crops and the contamination of surface and groundwater using the high-performance liquid... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbicide; Environmental impact; Persistence in soil. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100271 |
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| 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 |
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| 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 |
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| PEREIRA,G.A.M.; BARCELLOS JR.,L.H.; GONÇALVES,V.A.; SILVA,D.V.; FARIA,A.T.; SILVA,A.A.. |
| ABSTRACT Knowledge of herbicides sorption by colloids predicts its movement in the soil profile and its effectiveness in controlling weeds and crops poisoning when directly applied to the soil. This knowledge becomes even more important for herbicides which have long persistence in the soil. In this research, clomazone sorption was estimated by the biological method in Brazilian soil samples with different physical and chemical characteristics, cultivated with sugarcane crops. As an indicator of the presence of clomazone in the soil, Sorghum bicolor was used. The data relating to assessments of poisoning and accumulation of dry matter of the plants were subjected to multivariate analysis of similarity among variables. After that, clomazone doses that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbicide retention; Herbicide behavior in the soil; Pollution potential; Herbicides impact. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000200357 |
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| FIALHO,C.M.T.; SILVA,A.A.; MELO,C.A.D.; COSTA,M.D.; SOUZA,M.W.R.; REIS,L.A.C.. |
| ABSTRACT: Weeds and microorganisms interacting with their rhizosphere may influence nutrient absorption, which is an important factor for plant competition. The purpose of this study was to evaluate the microbiological activity, inorganic phosphorus solubilization (Pi) and acid phosphatase in the cultivated soil, in a combination of soybean (Glycine max) plants and weeds. Soybeans were cultivated in monoculture and in competition with Bidens pilosa, Brachiaria decumbens (Syn. Urochloa decumbens) and Eleusine indica, under two conditions: a) plants competing without contact between the roots b) plants competing with contact between the roots. A nylon screen with a 50 µm mesh was added to prevent contact between the roots of the species in competition so... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Soil respiratory rate; Metabolic quotient; Inorganic phosphorus solubilization; Phosphatase. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100247 |
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| 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 |
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| 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 |
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| MARINHO,M.I.C.; SOUZA,W.M.; CABRAL,M.F.; CASTRO NETO,M.D.; QUEIROZ,M.E.L.R.; SILVA,A.A.. |
| ABSTRACT: The characterization of sorption-desorption for imazethapyr and imazapic in six agricultural soils was performed to assess the availability of these herbicides in pollution processes. In this pursuit, the batch equilibrium method and high-performance liquid chromatography were used. The magnitude of Kf values ranging from 0.38 to 2.52 mg1-n kg-1 Ln for imazethapyr and 0.43 to 2.72 mg1-n kg-1 Ln for imazapic indicate weak sorption in the evaluated soils. Soil pH (5.1 to 6.1) and iron oxalate affect sorption-desorption of both herbicides but the type and percentage of clay can be the main factor affecting these two processes. A high desorption percentage (>70%) was found in Regosol, Dystric Plinthosol, Ferralsol (for both herbicides), and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbicides; Imidazolinone; Pollution; Batch equilibrium. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100342 |
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| 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 |
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| 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 |
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| 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 |
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| RAPOSO JR.,R.; PEREIRA,G.A.M.; MATOS,C.C.; BARCELLOS JR.,L.H.; PAULA,D.F.; SILVA,A.A.. |
| ABSTRACT: The 2-Chloroethylphosphonic acid (ethephon) and calcium carbide are used to induce and synchronize the flowering of pineapple crop. Some farmers have used the 2,4-D herbicide in combination with these flowering inducers. This practice is based on the hypothesis that 2,4-D would act as a growth regulator, increasing fruit size and weight. The objectives of this work was to verify if the use of 2,4-D, associated to calcium carbide or ethephon, influences the productivity and quality of the pineapple fruits and, also if the use of this herbicide leaves residues in the fruits. For this, two field experiments were carried out in two different farms. The treatments consisted of the application of ethephon and calcium carbide, alone, and in a mixture... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ananas comosus; Dichlorophenoxyacetic acid; Floral inducer; Plant growth regulator. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100174 |
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| 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 |
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| 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 |
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| Registros recuperados: 26 | |
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