Time filter

Source Type

Sartor L.R.,Federal Technological University of Parana | Lopes L.,Federal Technological University of Parana | Martin T.N.,University Federal Of Santa Mariars | Ortiz S.,Federal Technological University of Parana
Bioscience Journal | Year: 2015

Agrosilvipastoris systems are expanding the spaces occupied and gaining new adherents in order expansions productive in the same areas. But some issues, such as allelopathic effects of some cultures, in which case the pine, are still poorly known. This research aimed to evaluate the allelopathic effect of aqueous extract from the pine needles on the germination and development of lettuce, corn and beggarticks seedlings. The experiment was carried in a completely randomized design with treatments arranged in a factorial (2x5), where: conditions of the needles (green and dry) x extracts concentrations (0, 25, 50, 75 and 100%) in four replications, under temperature, humidity and light controlled. Evaluations were carried out time intervals of 24 hours, from 0 to 144 hours. It was evaluated the germination, average speed of germination, the length of the primary roots of lettuce and the length from the seedlings roots of lettuce, beggarticks and corn. Extracts the base of green needles affected the variables, where the effect increased with increase in concentration, the effect being more marked in beggarticks. In the statement the basis of dry pine needles, there were minimal results when compared to control. © 2015, Universidade Federal de Uberlandia. All rights reserved. Source

de Avila L.A.,Federal University of Pelotas | Martini L.F.D.,Federal University of Pelotas | Mezzomo R.F.,University Federal Of Santa Mariars | Refatti J.P.,Federal University of Pelotas | And 6 more authors.
Agronomy Journal | Year: 2015

In the Brazilian state of Rio Grande do Sul, rice (Oryza sativa L.) is predominantly grown using continuous food irrigation, which requires large quantities of fresh water. Due to increasing scarcity and demand for water, modern agricultural systems need to produce more food with less water. The objective of this study was to evaluate the effect of different irrigation management systems on water use effciency, quantity of water loss due to runof, and rice grain yield. The experiments were conducted from 2007 through 2010 at an experimental station of the Plant Protection Department of the Universidade Federal de Santa Maria, Rio Grande do Sul state, Brazil, on an Albaqualf sandy-loam soil. Treatments consisted of two irrigation management systems: continuous fooding (CF) at approximately a 10-cm food depth and intermittent irrigation (II) where the food was allowed to fully subside before being re-established to a 10-cm depth. Intermittent irrigation increased storage of rainwater by reducing runof water by 56% compared with CF. In addition, II reduced irrigation water use by 22 to 76% resulting in a 15 to 346% increase in water use effciency (WUE). Rice yield was not affected by II compared with CF. Intermittent irrigation provides greater water conservation, does not reduce rice yield compared with CF, and improves the WUE of rice. © 2015 by the American Society of Agronomy, 5585 Guilford Road, Madison, WI 53711. All rights reserved. Source

Pinto J.A.V.,University Federal Fronteira Sul | Thewes F.R.,Federal University of Santa Maria | Schorr M.R.W.,Federal University of Santa Maria | Ceconi D.L.,Federal University of Santa Maria | And 3 more authors.
Bioscience Journal | Year: 2015

In order to obtain more consumers approval, fruit require high quality during commercialization, making the improvement of new storage technologies necessary. Thus, the aim of this study was to evaluate the best mass loss level on ‘Murcott’ tangor quality maintenance after cold storage during 10 weeks. The treatments evaluated were: [1] 0% of mass loss (100 % of relative humidity); [2] 3% of mass loss; [3] 6% of mass loss and [4] 9% of mass loss, with 5 replicates of 18 fruits each treatment. The storage temperature was maintained at 4.0°C (±0.2°C). The experiment was conducted in a completely randomized design. After 10 weeks of storage plus seven days of shelf life at 20°C it was verified that with the mass loss increase, the decay incidence and the succulence are suppressed, mass loss also increased the soluble solids and titratable acidity. The best mass loss level for ‘Murcott’ tangor storage stay between 3 up to 6% because it reduces the decay incidence and turgor loss and maintain chemical qualities, such as ascorbic acid, soluble solids and titratable acidity. © 2015, Universidade Federal de Uberlandia. All rights reserved. Source

Discover hidden collaborations