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Campos dos Goytacazes, Brazil

This study aims to evaluate the forest horizontal structure of Cafundó Natural Heritage Private Reserve, located in Cachoeiro de Itapemirim, Espírito Santo. In order to that, twenty five plots were established (total area: 2,5 hectares) and all trees with DBH ≥ 5 cm were surveyed. A total of 4557 individuals were sampled, distributed in 255 species, 152 genera and 54 families. The diversity index (H') was 4,13. The values of basal area (33,02 m2.ha-1) and density (1823 ind.ha-1) are closed to the range of other Semideciduous Seasonal Forest in Southeast. The species with the highest importance value (IV) were: Astronium concinnum, Pseudopiptadenia contorta, Neoraputia alba. This forest fragment is composed predominantly by late secondary species and can be characterized as well preserved, with considerable species diversity and peculiar aboreal flora, standing out the ecological importance of this area for conservation in the south region of the Espírito Santo. Source

Altoe J.A.,UENF | Marinho C.S.,State University of Norte Fluminense
Revista Brasileira de Fruticultura | Year: 2012

The serial minicutting is a usual technique for commercial propagation of Eucalyptus and its application has been shown positive effect on the rooting of clones with poor rooting potential. The aim of this study was to evaluate the serial minicutting technique on minicuttings rooting and survival, and the vigor of the 'Paluma'guava plantlets. It was carried out two experiments in randomized blocks design with four replications and five plants per plot. At sixty-two days after cutting, it was verified that the minicuttings showed survival higher than 90% and 90% of rooting. The plantlets produced by minicuttings of the subculture (plantlets obtained from ministumps originated from rooted minicuttings), at 138 days after cutting, showed height smaller than that observed in plantlets obtained from minicuttings of the first culture (plantlets obtained from ministumps originated by the conventional cutting process). On the other hand, evaluations at 145 days after cutting demonstrated that the plantlets produced by minicuttings of the subculture presented the same growth vigor in the leaf area, leaf number and dry mass of the shoot and the root when compared to minicuttings of the first culture. Source

Neto A.S.M.,State University of Norte Fluminense | Jasmim J.M.,UENF | Ponciano N.J.,UENF
Ciencia Rural | Year: 2011

The purpose of the research was to determine, through the calculation of net present value (VPL), internal return rate (TIR) and Economic Payback (PBE), the viability of heliconias production in the Rio de Janeiro State, as well as identify and verify, by means of sensitivity analysis in which extent some factors of the production system exercise impact on the profitability of the producing regions. The results showed that helicônia production is a profitable activity, according to the method of TIR and considering minimal attractiveness rates (TMA) of 6% and 12% for calculating the net present value (VPL). However, there are limitations in the sector of produce flow, delaying the consolidation of this market. The percentage of losses and the selling price of the product presented determinant factors on the time of return on investment (PBE). In addition, the selling price of the product was the variable with greater effect on profitability, followed by the land value and the seedlings cost. Source

Filho J.A.V.,State University of Norte Fluminense | Lima K.B.,State University of Norte Fluminense | Freitas M.S.M.,State University of Norte Fluminense | Martins M.A.,UENF | Olivares F.L.,UENF
Revista Brasileira de Fruticultura | Year: 2012

An experiment, at greenhouse conditions, was carried out to evaluate the effects of inoculation with mycorrhizal fungi (AMF) and diazotrophic bacteria, on sweet passion fruit seedling growth under different phosphorus levels. The experiment design was randomized blocks in 3x2x4 factorial, with three treatments with fungi: Gigaspora margarita, Glomus clarum and control (without fungus); two treatments with bacteria: Burkholderia sp. + Burkholderia silvatlantica and control (without bacteria); and four P levels: 0, 15, 30 and 60 mg dm -3 of soil, with four replications. The experimental unit consisted of a 3.5 dm -3 pot with three plants. The seedlings were grown from seed and transplanted to pots containing a sterile soil: sand mixture (1:2 v: v). At 90 days after transplantation were assessed: height, diameter of stem, leaf area, shoot dry weight, percentage of root colonization by fungi and enumeration of diazotrophs in roots. Despite the presence of diazotrophic bacteria, inoculation with AMF provided increase in height, shoot dry weight, leaf area and stem diameter of seedlings, both at 0 and 15 mg dm -3 of P levels. Bacteria increased height and leaf area in shoots when associated with the AMF species of G. margarita, however in the absence of AMF, they reduced the shoot dry mass, regardless of P levels in the substrate. Source

Rocha M.V.,UENF | Sthel M.S.,UENF | Silva M.G.,UENF | Paiva L.B.,UENF | And 3 more authors.
Applied Physics B: Lasers and Optics | Year: 2012

In this work we present a laser photoacoustic arrangement for the detection of the important greenhouse gas methane. A quantum-cascade laser and a differential photoacoustic cell were employed. A detection limit of 45 ppbv in nitrogen was achieved as well as a great selectivity. The same methodology was also tested in the detection of methane issued from natural gas powered vehicles (VNG) in Brazil, which demonstrates the excellent potential of this arrangement for greenhouse gas detection emitted from real sources. © Springer-Verlag 2011. Source

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