Instituto Federal Do Norte Of Minas Gerais

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Instituto Federal Do Norte Of Minas Gerais

Brazil
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Dutra T.R.,Instituto Federal Do Norte Of Minas Gerais | Massad M.D.,Instituto Federal Do Norte Of Minas Gerais | Sarmento M.F.Q.,Federal University of Minas Gerais
Floresta | Year: 2017

This study aimed to evaluate the growth and quality of canafístula seedlings (peltophorum dubium (Spreng.) Taub.) In response to different doses and formulations of slow release fertilizer (FLL) Osmocote®. The design was adopted in a randomized block design with three replications, in a factorial 2 x 5, consisting of two formulations of Osmocote® (15-09-12 with release 5 to 6 months, and with the release of 19-06-10 3 to 4 months old) and five of the same dosages (0, 2.5, 5.0, 7.5 and 10.0 g dm-3). Were evaluated: height, stem diameter, dry matter shoot, root and all, in addition to the height / stem diameter, height / shoot dry weight, dry weight shoot / dry root mass and Dickson quality index. The canafístula seedlings responded to the use of FLL Osmocote®, with better growth and quality standard in doses ranging from 5.4 to 8.2 g dm-3. The formulation 19-06-10 was able to provide for the production of Peltophorum dubium seedlings with good growth.


Almeida I.C.C.,Instituto Federal Do Norte Of Minas Gerais | Schaefer C.E.G.R.,Federal University of Viçosa | Michel R.F.M.,University Estadual Of Santa Cruz | Fernandes R.B.A.,Federal University of Viçosa | And 5 more authors.
Catena | Year: 2017

Knowledge on active-layer dynamics and permafrost distribution is of especial importance in Maritime Antarctica, where dramatic climate warming occurred in the last decades. Few long-term studies of active-layer temperatures in this region, and no one focus on recently deglaciated areas under paraglacial conditions. This paper analyses the long-term soil thermal regime of a warm-based glacial front site located at Low Head, King George Island. The monitoring system consists of soil temperature probes connected to a datalogger that recorded data at hourly intervals. We calculated the thawing days (TD), freezing days (FD), number of isothermal days (ID), number of freeze-thaw days (FTD), thawing degree days (TDD), freezing degree days (FDD), and the apparent thermal diffusivity (ATD). The results indicate that active layer thermal regime at Low Head is similar to other periglacial environments from Maritime Antarctica, with differences associated with the influence from the nearby warm-based glacier. Surface temperatures show greater variations during the summer resulting in frequent freeze and thaw cycles, mainly (1 cm and 10 cm). The temperature profile during the studied period indicates that the active layer thickness reached a maximum of 106 cm on February 7th 2015. Soil temperature buffering was limited by the low snow cover, low soil moisture, and absence of vegetation. Based on the high interannual variability detected during the five years monitoring run, we stress that longer monitoring periods are necessary for a more detailed knowledge on how permafrost respond to climate changes in this rapidly warming zone. © 2016 Elsevier B.V.


Balduino G.,Mato Grosso State University | Marques T.,Instituto Federal Do Norte Of Minas Gerais | Bessa E.,University of Brasilia
Environmental Biology of Fishes | Year: 2017

Nature-based tourism is a growing industry in recent years, including underwater trails in clear headwater streams. These activities, however, bring little known impacts, most of them in the individual and population levels. To investigate if human presence can affect the fish community, we compared similar reference and tourism areas in terms of species accumulation curve, ecological indicators (richness, total abundance, diversity and dominance), composition similarity and indicator species. Only fish abundance did not differ between reference and tourism areas. Richness, diversity and dominance were all higher in tourism areas. Fish species composition also differed between reference and tourism, guided by species substitution. We add ecological data to previous behavioral studies that have already evidenced the effects of tourism on fish. We also suggest a strict control of the number and permanence of visitors in the water, the forbiddance of fish feeding and maintenance of the riparian coverage to avoid irreversible damages to these fragile environments. © 2017 Springer Science+Business Media Dordrecht


de Aquino L.A.,Federal University of Viçosa | dos Santos Junior V.C.,Instituto Federal Do Norte Of Minas Gerais | Guerra J.V.S.,Instituto Federal Do Norte Of Minas Gerais | Costa M.M.,Instituto Federal Do Norte Of Minas Gerais
Bragantia | Year: 2011

Simple, rapid, and non-destructive methods that help to estimate leaf area accurately are very important to assess plant growth under field conditions. The objective of this study was to adjust equations to estimate the area of a single sunflower leaf and also the area of total leaves per plant as a function of linear measurements of them. It was also verified the possibility of using common models for the sunflower cultivars BR-122 and M-734. Six plants of each cultivar in the early stage of flowering and full flowering were harvested. The area of each leaf was determined by the direct method. The length along the midrib and the width perpendicular to leaf insertion in the petiole were determined. Linear, quadratic, cubic, exponential, and potential models were adjusted. The potential models Ŷ i = 1.6329X i 1,7164 and Ŷ i = 0.5405X i 1,0212 using the width measurements and width x length, respectively, were the most adequate to estimate the leaf area. The model Ŷ i = 5.1014X i 2,4383 allowed to precisely estimate the total leaf area according to the number of leaves per plant. The accuracy of the adjusted equations to estimate each leaf are and total leaves area was not reduced when common models were adjusted to the two cultivars used.


Pereira T.T.C.,Minas Gerais State University | Schaefer C.E.G.R.,Federal University of Viçosa | Ker J.C.,Federal University of Viçosa | Almeida C.C.,Federal University of Viçosa | And 2 more authors.
Geoderma | Year: 2013

Large amounts of organic matter of marine origin are seasonally deposited on ice-free soils by birds and mammals, especially penguins, in some restricted Antarctic terrestrial ecosystems. The incorporation of this material into the mineral soil matrix becomes the main pathway for the widespread formation of phosphate minerals and ornithogenic soils, enhancing local biodiversity and complexity. These soils have been well-studied in Maritime Antarctica, and comparatively neglected in the cold, dry polar Antarctica. Hence, we studied the influence of penguins on soil and landscape formation at Hope Bay, a transition climatic zone in Antarctic Peninsula, where no previous pedological study has been undertaken with regards to soil phosphatization. Ten pedons, nine of which are ornithogenic, were described, sampled, and analyzed for physical, chemical and mineralogical properties. Results indicate that the slow mineralization of bird guano, coupled with high levels of organic matter and reduced leaching, notably Ca, contribute to reduced soil acidification and low exchangeable Al3+ content, unlike ornithogenic soils from Maritime Antarctica. Phosphate minerals typical of the phosphatization process, such as taranakite, minyulite, leucophosphite, struvite, and fluorapatite, were detected. In Hope Bay, they are subjected to very slow rates of dissolution, neoformation of secondary phosphatic minerals, and mineralogical transformation and leaching processes. Ornithogenesis is viewed as a mechanism of sea-land nutrient transfer, enriching the latter, since the parent rocks are chemically poor sedimentary materials. On the other hand, the presence of kaolinite indicates wetter climate conditions in the past, with periods with greater moisture and weathering, compared with the current semi-polar desert environment. We conclude that the phosphatization process overprints previously weathered sedimentary materials. © 2013 Elsevier B.V.


Pereira T.T.C.,Federal University of Viçosa | Schaefer C.E.G.R.,Federal University of Viçosa | Ker J.C.,Federal University of Viçosa | Almeida C.C.,Federal University of Viçosa | Almeida I.C.C.,Instituto Federal Do Norte Of Minas Gerais
Geoderma | Year: 2013

Micromorphological investigations of Antarctic soils are comparatively scarce, however, they could help understand the genesis of cryogenic soils under extreme polar conditions and different biotic factors. In most areas of Maritime Antarctica, the soil structure is apparently influenced by the local lithology, cryoturbation, guano deposition and reaction of guano solutions. The present study was carried out in Hope Bay, in the northern part of the Antarctic Peninsula, possibly one of the oldest sites of penguin occupation in the region. We describe and analyze the most important micro and sub-microscopic features of selected Ornithogenic Cryosols (Gelisols) from this part of Antarctic Peninsula, representing a transitional climatic zone between the wetter South Shetlands and the much drier Weddell Sea sector. Nine pedons representing the main ornithogenic soils found in ice-free areas of Hope Bay were selected for the micromorphological study. Undisturbed soil blocks were sampled at different depths, ranging between 0 and 30. cm. The microstructure and sub-microstructure were further investigated using a JEOL 8200 and a Zeiss scanning electron microscopes, both coupled with an microprobe (SEM/WDS). These pedons have a very limited surface accumulation of organic matter formed by mosses and lichens, changing abruptly to a mineral phosphatic horizon of bleached colours, and usually hardcemented by ice. A small to medium-sized granular structure is generally observed, with ovoidal, subrounded forms, including several well-defined ornithogenic materials, such as P-rich organic remains, nodular phosphates forms and minute fragments of bone apatite. The chemical composition of ornithogenic materials and phosphatic coatings indicates the presence of discrete forms of taranakite, minyulite, leucophosphite, struvite and fluorapatite, typical of phosphatization process in these soils. Phosphatization and enhanced chemical alteration of the substrate and is one of the main soil-forming process in ornithogenic soils, resulting in P-rich ovoidal aggregates formation. P-rich solutions penetrate desiccation fractures and cleavage planes in large clasts and react preferably with plagioclases. P reacts with Al and Fe to form various amorphous and crystalline P phases. Present day permafrost cementation of deeper phosphate layers indicate that warmer/wetter conditions occurred in the past, during which P was leached downwards and reacted with the rock substrates, developing stable ovoidal aggregates, now incorporated in ice-cemented subsurface horizon. © 2012 Elsevier B.V.


de Abreu F.V.S.,Instituto Federal Do Norte Of Minas Gerais | Morais M.M.,Centro Universitario Of Belo Horizonte | Ribeiro S.P.,Federal University of Ouro Preto | Eiras A.E.,Federal University of Minas Gerais
Memorias do Instituto Oswaldo Cruz | Year: 2015

Despite the importance of the mosquito Aedes aegypti in the transmission of arboviruses, such as yellow fever, Chikungunya fever and dengue fever, some aspects of their behaviour remain unknown. In the present study, the oviposition behaviour of Ae. aegypti females that were exposed to different densities of breeding sites (2, 4, 8 and 16) was evaluated in laboratory and semi-field conditions. The number of breeding sites that were used was proportional to the number available, but tended towards stabilisation. Females used four-six breeding sites on average, with a maximum of 11. A high percentage of eggs was observed in the water, along with the presence of a breeding site termed “favourite”, which received at least 40% of the eggs. The results are discussed in ecological, evolutionary and epidemiological approaches. © 2015, Fundacao Oswaldo Cruz. All rights reserved.


de Aquino L.A.,CRP UFV | Aquino R.F.B.A.,Campus Rio Paranaiba | Silva T.C.,Instituto Federal Do Norte Of Minas Gerais | dos Santos D.F.,Instituto Federal Do Norte Of Minas Gerais | Berger P.G.,Avenida PH Rolfs
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2012

This work aimed to evaluate the effect of phosphorus application in rainfed and irrigated crop on shoot dry matter, the absorption and nutrient exportation, and yield of cotton crop. The experiment was carried out in a Psament in the northeren part of Minas Gerais State, Brazil. The experimental design was in randomized blocks with four replications in a factorial arrangement of two doses of P2O5 x two cropping systems. Two additional treatments in each system without phosphorus application completed six studied treatments. Accumulation of dry biomass, absorption and exportation of nutrients, and yield of seed cotton were evaluated. Phosphorus levels did not influence the accumulation of shoot dry biomass. P supply increased the exportation of P, Ca, Mg, S, and Mn under irrigated and of N, K, and Fe regardless of the cropping system. Irrigation increased the dry biomass of leaves, stems, and shoots at 80 days after emergency, and the absorption of N, P, K, Ca, Mg, S, Cu, Fe, Mn, Zn, and B, as well as their exportation by the crop. There was an increase in the number of bolls per plant, fiber yield and productivity through the irrigation use. Increasing productivity with P application was conditioned to irrigation.


Chagas C.S.,EMBRAPA - Empresa Brasileira de Pesquisa Agropecuária | Fontana A.,EMBRAPA - Empresa Brasileira de Pesquisa Agropecuária | de Carvalho Junior W.,EMBRAPA - Empresa Brasileira de Pesquisa Agropecuária | de Caires S.M.,Instituto Federal Do Norte Of Minas Gerais
Revista Brasileira de Ciencia do Solo | Year: 2013

The topographic conditions controls many hydrological, geomorphological and pedological processes, affectting the solar radiation, pluvial precipitation, superficial water flow, evaporation, soil moisture and vegetation types, among others. Topographic properties derived from a digital elevation model were used to explain the differentiation between soils with an argillic horizon in the region of "Mar de Morros" in the northwestern State of Rio de Janeiro. Eight soil profiles (four Red Argisols and four Red-Yellow Argisols) developed from noritic granulites, in the municipalities of São José de Ubá and Itaperuna, were studied. The topographic data of each soil profile (elevation, slope, aspect, curvature plan and profile, solar radiation and combined topographic index) were extracted using a 7 x 7 pixel window, with the profiles in the center. Argisols on slopes facing northwest and northeast receive most solar radiation (warmer and drier) and for this reason are red, eutrophic and have no oxic horizon, whereas soils on slopes facing southeast (relatively cold and wet) are yellowish-red, dystrophic and have an oxic horizon. The solar radiation, slope and aspect are the topographic attributes that differ between the soils profiles. The topographic properties analyzed by multivariate techniques were effective to distinguish eutrophic Red Argisols from dystrophic Red-Yellow Argisols, except for P7 (PVe). Studies on the influence of solar radiation on pedogenesis under tropical conditions are scarce, and although less active in tropical regions directly determined the soil differentiation of the studied area.


Costa R.I.F.,Instituto Federal Do Norte Of Minas Gerais | Souza B.,Federal University of Lavras | De Freitas S.,São Paulo State University
Neotropical Entomology | Year: 2010

In order to study the interactions of green lacewings toxocenosis on natural ecossystems, samplings were carried out in the Parque Ecológico Quedas do Rio Bonito, located in Lavras, Alto Rio Grande region, South of Minas Gerais, Brazil. The species inventory was accomplished in two vegetation types: semi-evergreen forest and open field formations, including areas of montane grassland, rocky montane grassland and "cerrado". Insects were captured with a butterfly net during 2h, walking through each vegetation formation. Sampling resulted in 1,948 specimens belonging to 30 species, of which 14 were Chrysopini and 16 Leucochrysini. Representatives of these tribes were observed both in forest and in open field formations. Species of the genera Ceraeochrysa, Chrysoperla, Chrysopodes, Plesiochrysa and Leucochrysa were found in forests and in open field formations, except for Plesiochrysa. The highest richness and diversity of species were observed in the forest. The similarity index among the communities of green lacewings in the studied areas was 27%.

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