900 resultados para Queimas controladas
Resumo:
The objective of this study was to evaluate the possibility of reducing spray concentration and volume of Fluazifop-p-butyl applications on postemergence soybeans, while maintaining weed control and growth selectivity. The study was conducted in the experimental area of the Teaching and Research Farm of FCAV/Unesp - Jaboticabal Campus, during the agricultural season of 1998/99, carried out on a crop of soybean cultivar FT 2009. The experimental setup utilized was a randomized block design with 24 treatments, 20 following a factorial scheme 2 x 2 x 5 and 4 control treatments. The factors examined were: spray volume (100 and 200 L ha-1); reduced spray concentration - 75.2 and 112.8 g of fluazifop-p-butyl/ha (40 and 60% of the recommended concentration, respectively); and application schedule (5 A.M., 9 A.M., 1 P.M., 5 P.M. and 9 P.M.). The controls were applications at the recommended concentration (188.0 g fluazifop-p-butyl/ha), using volumes of 100 and 200 L ha-1, and treatments without weed control and weeds controlled with manual hoeing. The main species of weeds that emerged in the experimental area were: Cenchrus echinatus, comprising 60% of the infested sections; Digitaria horizontalis, 10%, and Eleusine indica, 30%. All fluazifop-p-butyl applications made up to 9 A.M. and from 5 P.M. effectively controlled the three species of weeds and provided a selective growth of soybeans. Therefore, the use of fluazifop-p-butyl can be optimized by reducing both the concentration and the volume of the spray for applications times providing favorable conditions for crop dusting.
Resumo:
Digitaria species are sugar cane crop weeds in Brazil and are being controlled with herbicides, although there are some reports of control failure, notably to the triazine group. Molecular techniques are recommended to analyze the genetic variability in weeds. RAPD (Random Amplified Polymorphic DNA), PCR-RFLP (Polymerase Chain Reaction - Restriction Fragment Length Polymorphism) and, in combination with sequencing, allow the localization of resistance genes, as well as possible mutations related to the onset of resistant individuals in some species. Thus, the objective of this work was to characterize ten accessions of Digitaria spp. by RAPD and PCR-RFLP markers, to sequence a conserved region of the psbA gene and evaluate the accessions response to ametryn. As showed by molecular analysis there was high genetic similarity among the accessions, all of them presented similar genetics profiles and were susceptible to ametryn.
Resumo:
Pós-graduação em Agronomia (Entomologia Agrícola) - FCAV
Resumo:
Pós-graduação em Artes - IA
Resumo:
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Resumo:
Pós-graduação em Agronomia (Entomologia Agrícola) - FCAV
Resumo:
The knowledge of the mechanical properties of nickel-titanium (NiTi) termoactives of the more accessible of the domestic market is still limited. Given this, the objective of this study was to evaluate and compare through deflection tests in brackets NiTi wires 03 term rectangular gauge 0.014 '' enabled x 0.025 '' and 0.016 '' x 0.022 '' of different brands (MORELLI (R), ORMCO (R) ORTHOSOURCE (R), ORTHOMETRIC (R), EURODONTO (R) and ADITEK (R)). All tests were carried out on universal testing machine EMIC DL 2000 under identical conditions and controlled at a temperature of 36 degrees C +/- 0.5 degrees C. Five measurements (N= 5) were performed for each thickness/wire tag that was deflected up to a limit of 4.0mm at a speed of 1.0mm/min. Each 0.2mm (round trip) of corresponding strength measured deflection for the construction of the graph of force x deflection at Tesc program version 3.04. Each graphic was evaluated according to the following variables: beginning of the Martensitic transformation (cN and mm), maximum strength (cN), the beginning and end of the plateau of deactivation (cN and mm) and length (mm) plateau. The average and standard deviation were calculated for all variables and statistical analysis was made by ANOVA tests 2 criteria and Turkey or Kruskal-Wallis and Dunn, a 5% level of significance. The results showed that the tests of 0.014 '' x0.025 '' ORTHOMETRIC (R) brands and ORMCO (R) showed the best results, as well as the wires of the MORELLI (R) and ORTHOSOURCE (R) to wires 0.016 '' x0.022 ''. In General, the gauge wires 0.014 '' x0.025 '' showed strength levels on the plateau of deactivation to 6 x smaller than 0.016 '' x0.022 '' caliber.
Resumo:
Pós-graduação em Agronomia (Produção Vegetal) - FCAV
Resumo:
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Resumo:
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Resumo:
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Resumo:
In this article, we present different interpretations to the phenomenon of velar fronting, found in the speech of children. This phenomenon is discussed under both of the following paradigms: the symbolic one – which considers the existence of segments as sources of categorical representations – and the dynamic one, which not only considers different representational units, but also provides an alternative conception of what may be taken as a representation. The analysis focuses on acoustic data produced by children of about three years of age under controlled conditions in a ludic context. The results indicate that the subjects have a covert contrast between alveolars and velars that may be interpreted in light of at least three dynamic hypotheses.
Resumo:
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Resumo:
Pós-graduação em Aquicultura - FCAV
Resumo:
Insetos são estudados como modelos biológicos e evolutivos devido, principalmente, ao tamanho reduzido e ciclo de vida curto, tendo importância ecológica pelo fato de gerarem diversos benefícios em todos os ecossistemas e estarem presentes em todos os níveis tróficos. A espécie Zaprionus indianus pertence à família Drosophilidae, é nativa da África Tropical e foi recentemente introduzida no Brasil, causando grande preocupação devido aos danos causados na produção de figo roxo (Ficus carica). A temperatura é um dos fatores abióticos que influencia a velocidade de desenvolvimento, fecundidade e dispersão dos insetos, provocando alterações em aspectos morfológicos e relativos ao ciclo de vida de drosofilídeos. Estudos sobre a influência da temperatura no desenvolvimento de Z. indianus são importantes para um futuro programa de controle dessa praga, de acordo com as características climáticas de cada região. Este trabalho teve como objetivo avaliar o efeito de diferentes temperaturas, em diferentes densidades larvais, sobre a espécie Z. indianus, visando analisar sua curva de crescimento e tamanho de asa. Adultos de Z. indianus foram coletados nas dependências da Universidade Estadual Paulista (Rio Claro - SP), com auxílio de puçá entomológico. Da amostra de drosofilídeos coletados, os espécimes de Z. indianus foram identificados e mantidos em potes plásticos redondos, estes acondicionados em câmaras climáticas sob condições controladas de temperatura e umidade e fotoperíodo. Foi oferecida como alimento dieta artificial comum de drosofilídeos feita à base de banana. Os ovos obtidos foram contados e separados em densidades de 100 e 500 indivíduos, em duplicata para cada densidade e temperatura testadas; os imaturos foram mantidos sob as mesmas condições que os parentais, exceto pela temperatura que foi estipulada de forma a se estudar os efeitos de três... (Resumo completo, clicar acesso eletrônico abaixo)