DSpace Communidade:
https://rd.uffs.edu.br/handle/prefix/2523
2023-09-27T20:33:13ZComposição da matéria orgnânica do solo e de montes de cupins na região de Piracicaba-SP
https://rd.uffs.edu.br/handle/prefix/6568
Título: Composição da matéria orgnânica do solo e de montes de cupins na região de Piracicaba-SP
Autor(es): Ferreira, Fernando Perobelli
Instituição: Universidade de São Paulo
Tipo: Relatório de Pesquisa2023-02-22T00:00:00ZInfluências das mudanças climáticas no potencial tóxico de pesticidas para espécies da fauna invertebrada do solo: Etapa 2
https://rd.uffs.edu.br/handle/prefix/6058
Título: Influências das mudanças climáticas no potencial tóxico de pesticidas para espécies da fauna invertebrada do solo: Etapa 2
Autor(es): Alves, Paulo Roger Lopes
Instituição: Universidade de São Paulo
Tipo: Relatório de Pesquisa2022-10-24T00:00:00ZRelatório circunstanciado das atividades desenvolvidas no período de Pós-Doutorado
https://rd.uffs.edu.br/handle/prefix/4151
Título: Relatório circunstanciado das atividades desenvolvidas no período de Pós-Doutorado
Autor(es): Radons, Sidinei Zwick
Instituição: Universidade Federal de Santa Maria
Tipo: Relatório de Pesquisa2020-01-01T00:00:00ZEcologia da germinação e potencial alelopático de capim-annoni-2 (Eragrostis plana Nees)
https://rd.uffs.edu.br/handle/prefix/3745
Título: Ecologia da germinação e potencial alelopático de capim-annoni-2 (Eragrostis plana Nees)
Autor(es): Bittencourt, Henrique Von Hertwig
Primeiro Orientador: Trezzi, Michelangelo Muzell
Abstract/Resumen: The invasiveness of South African lovegrass in agroecosystems has been attributed
to its biological characteristics and the ecological relations. The ecology of species
germination and allelopathic interaction are poorly understood. The objective of this
work was to determine the influence of environmental factors on germination,
phytotoxicity of South African lovegrass extracts, to identify and quantify phenolic
allelochemicals present in their fractions, to determine the influence of phytomass and
soil degradation on the phytotoxicity of the aqueous extract, to monitor the degradation
of the compounds present in the extracts and to identify and quantify allelochemicals
in a infested soil. Experiments were carried out in the laboratory using materials
collected in the field. Seeds germinated at constant temperatures of 15 to 40 ° C, but
the percentages of germination were greater than 94 % only at alternating
temperatures. Exposure to light increased the frequency of normal seedlings.
Germination increased with increasing water potential and the number of normal plants
decreased with increasing sodium chloride concentration. The highest emergence rate
was observed with the seeds placed on the soil surface, whereas no emergence
occurred at 4 cm. A total of nine phenolic compounds with allelochemical potential
were identified in the fractions of extracts of South African lovegrass: caffeic acid,
coumaric acid, ferulic acid, gallic acid, vanillic acid, catechin, epicatechin, resveratrol
and rutin. The general decreasing order of general phytotoxicity of crude extracts in
the development of wheat and alfalfa seedlings was ethyl, methanolic, aqueous and
hexane acetate. An inversely proportional correlation was identified between vanillic
acid concentration and root and total alfalfa seedlings length. The simulation of
phytomass and soil degradation caused an increase in the phytotoxicity of the extracts
on germination and seedling development, proving the release of the allelochemicals
and the influence of the soil in the increase of its phytotoxicity. The ether extracts of
the straw and soil showed changes in their chromatograms from the first to the seventh
day of incubation, while the mixture of straw + soil showed greater changes only
between the first and third day of degradation. Four phenolic compounds with
allelochemical potential were identified in the South African lovegrass infested soil:
coumaric acid, ferulic acid, catechin and epicatechin. The concentration of these
compounds was higher at the soil surface and horizontally near the South African
lovegrass plants, showing an association between concentrations of allelochemicals
and plant distance.
Instituição: Universidade Tecnológica Federal do Paraná
Tipo: Tese2017-01-01T00:00:00Z