Abstract:RESUMO -Um experimento foi conduzido no laboratório da Embrapa Soja, Londrina-PR, com o objetivo de avaliar as correlações entre períodos de embebição, níveis de absorção de água e germinação das sementes da planta daninha Bidens pilosa (picão-preto). As sementes de picão-preto, colhidas em março de 1997, foram colocadas para embeber em água por períodos de 6, 12, 18, 24 e 48 horas. Em seguida, foi determinado o teor de água nas sementes e a condutividade elétrica dos seus exsudatos. A germinação foi avaliada … Show more
“…Para verificação da germinação, procedeu-se leitura diária durante sete dias com retirada das sementes germinadas. As sementes foram consideradas germinadas conforme descrito por De Feo et al (2002) e Adegas et al (2003), ou seja, quando se tornou visível a protrusão da radícula através do tegumento. A abertura diária das caixas Gerbox foi realizada em fluxo laminar.…”
"Contribution to the allelopatic study of Erythrina velutina Willd., Fabaceae". This work has used ethanol extract and respective fractions from Erythrina velutina in allelophatic rehearsal with seeds from Lactuca sativa. It was observed that, except for the ethyl acetate fraction, the ethanol extract and fractions has been capable to influence the germination and growth of the seeds from L. sativa.
“…Para verificação da germinação, procedeu-se leitura diária durante sete dias com retirada das sementes germinadas. As sementes foram consideradas germinadas conforme descrito por De Feo et al (2002) e Adegas et al (2003), ou seja, quando se tornou visível a protrusão da radícula através do tegumento. A abertura diária das caixas Gerbox foi realizada em fluxo laminar.…”
"Contribution to the allelopatic study of Erythrina velutina Willd., Fabaceae". This work has used ethanol extract and respective fractions from Erythrina velutina in allelophatic rehearsal with seeds from Lactuca sativa. It was observed that, except for the ethyl acetate fraction, the ethanol extract and fractions has been capable to influence the germination and growth of the seeds from L. sativa.
“…Resultando no total para cada área de 25 amostras compostas para cada profundidade. As médias de saturação por alumínio estão entre valores altos (20,1 -45) e muitos altos (>45) de acordo com classificação de Osaki (1991) (ADEGAS et al 2003). Primeira contagem da germinação (PCG) -realizado conjuntamente com o teste de germinação aos 4 dias após semeadura (ADEGAS et al 2003).…”
Biodiesel stands out as an alternative for petroleum-based products, but its production generates a large amount of by-products. This study was carried out at the Instituto Federal de Educação, Ciência e Tecnologia do Sul de Minas Gerais, Campus Machado, with the objective of evaluating the impacts of the disposal of crude glycerin on agricultural soil and its microbial activity as well as in plant development. An experiment with a completely randomized design, five treatments, and five replicates was developed in the laboratory to analyze microbial activity. Soil samples of 100 g were incubated for 36 days with concentrations of crude glycerin, namely: 0; 48.7; 146.1; 292.2 L ha-1. Besides these four treatments, flasks without soil and glycerin have composed one more treatment. During this period, the CO2 volume released in each sample was evaluated 11 times. Another experiment was developed in the laboratory with hairy beggarticks’ achenes to evaluate crude glycerin effects on plant development. A randomized complete block design was used in a 4x2 factorial scheme, with five replicates, the same glycerin concentrations, and two glycerin sources (laboratory and biodiesel plant-unit). Crude glycerin stimulated soil microbial activity for doses of up to 143.83 L ha-1, being a positive indicative for future studies on its application to agricultural soils. Glycerin applications reduced the hairy beggarticks’ root protrusion, even at the lowest doses. Residues have Na+ contents that limit their application in agricultural soils.
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