Consulta: creatorFacets:"SILVA,A.A."
Registros recuperados: 26
Data/hora: 06/06/2024 04:43:03

Economic Threshold Levels for Signal Grass Control in Sugarcane Cultivars
Provedor de dados: 87
Autores: 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

PERSISTENCE OF IMIDAZOLINONES IN SOILS UNDER A CLEARFIELD SYSTEM OF RICE CULTIVATION
Provedor de dados: 87
Autores: 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

Estimation of Sulfentrazone Leaching in Isolated Application and in Mixture with Glyphosate
Provedor de dados: 87
Autores: 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

Impact of RR Soybeans and Glyphosate on the Community of Soil Surface Arthropods
Provedor de dados: 87
Autores: 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

2,4-D Hormesis Effect on Soybean
Provedor de dados: 87
Autores: 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

DIFFERENTIAL TOLERANCE OF SUGARCANE CULTIVARS TO CLOMAZONE
Provedor de dados: 87
Autores: 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

Glyphosate Impact on Arthropods Associated to Roundup Ready and Conventional Soybean (Glycine max L.)
Provedor de dados: 87
Autores: PEREIRA,J.L.; PEREIRA,R.R.; RESENDE-SILVA,G.A.; JAKELAITIS,A.; SILVA,A.A.; PICANÇO,M.C.
ABSTRACT: This study aims to evaluate the impact of glyphosate-resistant soybean and its management with glyphosate on the canopy arthropod community. We study the direct impact of the insertion of the resistance gene and the indirect impact of management practices, specifically herbicide application. To do this, we use the following treatments: non-GM and GM soybean with mechanical weed control and GM soybean with one and three applications of glyphosate. Arthropods in the crop canopy were sampled over time in all treatments. The incorporation of the glyphosate resistance gene did not affect the richness and abundance of arthropods in the plant canopy. Glyphosate application reduced the richness of predators and chewing and sucking phytophagous arthropods...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Transgenics; Phytophagous; Predators; Parasitoids; Detritivores.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100234

MOBILIDADE DO SULFENTRAZONE EM SOLOS COM DIFERENTES CARACTERÍSTICAS FÍSICAS E QUÍMICAS
Provedor de dados: 87
Autores: 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

Leaching and Persistence of Sulfentrazone when Mixed with Adjuvants
Provedor de dados: 87
Autores: 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

Competitive Capacity and Rhizosphere Mineralization of Organic Matter During Weed-Soil Microbiota Interactions
Provedor de dados: 87
Autores: MATOS,C.C.; COSTA,M.D.; SILVA,I.R.; SILVA,A.A.
ABSTRACT: The competition between weeds and crops is one of the main factors responsible for productivity losses in agricultural fields. This review aimed at presenting and discussing how the interactions between weeds and microorganisms can affect the competitive capacity of weeds and soil physicochemical properties. We also discuss how changes in the elemental stoichiometry of weeds can reflect their competitive and adaptative capacity. Although weeds are more dependent on associations with soil microorganisms than crops for growth, few studies have assessed the contribution of the soil microbiota to their competitive success in agroecosystems. When in competition, plants can change the elemental stoichiometry of their tissues in environments with varied...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhizosphere priming; Elemental stoichiometry; Soil quality; Agricultural sustainability.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100301

Levels of nutrients and grain yield of maize intercropped with signalgrass (Brachiaria) in different arrangements of plants
Provedor de dados: 87
Autores: 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

Effects of Adding Organic Matter to a Red-Yellow Latosol in the Sorption and Desorption of Tebuthiuron
Provedor de dados: 87
Autores: 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

Physical Compatibility and Stability of Pesticide Mixtures at Different Spray Volumes
Provedor de dados: 87
Autores: 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

Sorption of Clomazone in Brazilian Soils with Different Physical and Chemical Attributes1
Provedor de dados: 87
Autores: 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

Weed Community in a Raw Sugarcane Renovation Area Submitted to Different Soil Managements
Provedor de dados: 87
Autores: SOARES,M.B.B.; BIANCO,S.; FINOTO,E.L.; BOLONHEZI,D.; ALBUQUERQUE,J.A.A.; SILVA,A.A.
The objective of this study was to evaluate the weed community in a raw sugarcane renovation area with three soil managements and peanut sowing in succession. The experiment was conducted during the 2007/08 season on a raw sugarcane area harvested without prior burning in the last five cuts. A randomized block design with treatments arranged in a split plot and arranged in four replications was used. The main treatments consisted of three cropping systems: conventional tillage, minimum tillage and direct planting, and subplots consisted in the absence (resting) or presence of crop rotation with peanuts. After 135 days from planting peanuts and 180 days of sugarcane harvest, the number of weeds m-2 was counted and the shoot dry biomass of the weeds...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arachis hypogaea Saccharum spp. direct planting minimum tillage fallow; Phytosociology.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000100091

Glyphosate Herbicide Use in Urochloa brizantha Management in Intercropping With Herbicide-Resistant Maize
Provedor de dados: 87
Autores: 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

Use of 2,4-D in Mixture with Ethephon and Calcium Carbide in Pineapple Crop
Provedor de dados: 87
Autores: 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

Selection of Indicator Species of the Tembotrione Sorption in Soils with Different Attributes
Provedor de dados: 87
Autores: 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

Sorption and Desorption of Diuron, Hexazinone and Mix (Diuron + Hexazinone) in Soils With Different Attributes
Provedor de dados: 87
Autores: 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

Sorption and Desorption of Tembotrione and its Metabolite AE 1417268 in Soils with Different Attributes
Provedor de dados: 87
Autores: 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

Phytochemical Profile of Pasture Weeds from the Brazilian Cerrado
Provedor de dados: 87
Autores: 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

Weed Interference in Soybean Crop Affects Soil Microbial Activity and Biomass
Provedor de dados: 87
Autores: 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

Sorption-Desorption Behavior of Imazethapyr and Imazapic on Six Brazilian Soils
Provedor de dados: 87
Autores: 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 (&gt;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

Clomazone Leaching Estimate in Soil Columns Using the Biological Method
Provedor de dados: 87
Autores: 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

Edaphic Entomofauna Variation Depending on Glyphosate Application in Roundup Ready Soybean Crops
Provedor de dados: 87
Autores: PEREIRA,J.L.; ARAÚJO,T.A.; RODRIGUES-SILVA,N.; SILVA,A.A.; PICANÇO,M.C.
ABSTRACT: Currently, biomonitoring is a methodology used to verify the environmental impact of new technologies in the agricultural environment, highlighting edaphic entomofauna that is traditionally used as a bioindicator in this sort of research. Therefore, the objective of this study was to investigate the edaphic entomofauna variation depending on glyphosate application in Roundup Ready soybeans. The experiment was carried out in Coimbra, MG during the 2007/2008 and 2008/2009 cropping seasons. The experimental design was a randomized block design with five replications. The treatments were: non-transgenic soybean with mechanical weeding of weeds; transgenic soybean with mechanical weeding of weeds; transgenic soybean with one glyphosate application and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Bioindicators; Transgenic plants; Herbicide.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100307

Tembotrione Half-Life in Soils with Different Attributes
Provedor de dados: 87
Autores: 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