Chemical properties and microbial activity in castings of Chibui bari (oligochaeta) and surrounding soil [Caracterização química e atividade microbiana de coprólitos de Chibui bari (oligochaeta) e do solo adjacente]
Fiuza S.S.,Federal University of Acre |
Revista Brasileira de Ciencia do Solo | Year: 2011
Chibui bari is an edaphic oligochaeta from the Amazon region, called "minhocuçu" in view of its large size (length up to 60 cm). Their castings, in tower-shaped mounds with a height of up to 30 cm and dry weight of 2 kg, are common on the soil surface of Acre State. The objective of this study was to compare nutrient availability, organic carbon concentration and microbial activity in Chibui bari castings with soil of the surroundings under secondary forest, rubber cultivation and pasture, in areas of the Federal University of Acre - UFAC in Rio Branco, Acre. The experiment was arranged in a randomized block design, with three treatments consisting of a) Chibui bari castings and soil samples from within a radius of 10 cm from each casting from depths of b) 0-10 cm and c) 10-20 cm. The results were submitted to analysis of variance and treatment means compared by the Tukey test at 5 % probability. In addition, the simple correlation between the variables was analyzed. The pH values, available P, exchangeable cations (Ca2+, Mg2+, K+), organic carbon and microbial activity were higher in the castings than in the surrounding soil, whereas the Al3+ concentration was lower in castings in the 0- 20 cm layer by 55 % (pasture), 62 % (rubber cultivation) and 70 % (forest). There was also a positive correlation of soil organic carbon values with pH, P, K+, Ca2+ and Mg2+ and negative correlations of Al3+ with soil organic carbon, pH, K+, Ca2+ and Mg2+ in the three areas.
Bioactivity of diatomaceous earth to Sitophilus zeamais (Coleoptera: Curculionidae) in different application conditions [Bioatividade da terra de diatomácea para Sitophilus zeamais (Coleoptera: Curculionidae) em diferentes condições de aplicação]
Sousa A.H.,UFAC |
Faroni L.R.A.,Federal University of Viçosa |
Andrade G.S.,Federal University of Rondônia |
Freitas R.S.,Federal University of Viçosa |
Pimentel M.A.G.,Embrapa Milho e Sorgo
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2013
The objective of this study was to evaluate the insecticidal activity of diatomaceous earth (DE) at different ambient temperatures on adult Sitophilus zeamais and progeny, using different doses and exposure periods. The experiments were performed in Petri dishes containing 40 g of the whole corn kernel, treated with DE at doses of 0, 0.25, 0.5 and 1.0 kg Mg-1. Each dish was infested with 25 S. zeamais adults and kept at climatic chambers under temperatures of 20, 25, 30, 35 and 40 °C. The insect mortality was recorded after six and 15 days from the beginning of the bioassays. The grains evaluated at 15 days were separated from insects and kept in the dishes for another 75 days under the same temperature conditions. After this period the effect of ambient temperature and of diatomaceous earth doses on the emergence of S. zeamais in the F1 generation was evaluated. It was found that the mortality of S. zeamais increased with the higher dose and temperature during the exposure period of six and 15 days. The number of insects emerged reduced with increasing temperature in these two exposure periods. The increase of temperature and exposure period favored the efficacy of DE in lower doses for control of S. zeamais.
Physocalymma scaberrimum seedlings production in substrate composed by different percentages of organic residue of açaí. Physocalymma scaberrimum [Produção de mudas de Physocalymma scaberrimum em substratos compostos por diferentes porcentagens de resíduo orgânico de açaí]
Floresta | Year: 2012
Pohl is a native species that occurs mainly in the North and Midwest regions of Brazil, with potential for wood production, urban forestry and restoration of vegetation in degraded areas. Considering the need for better understanding of the seedlings behavior in the nursery, and use of agroforestry residue as components of substrate, this study aimed to evaluate the growth of this species in substrates composed by different percentages of açaí residue (0%, 25%, 50%, 75%, 100%) mixed with forest soil. The experiment was set up according to the completely randomized design, with 5 treatments (substrates) and 20 replicates. It was evaluated the growth of seedlings through shoot height, collar diameter, dry weights of shoot and roots and total, and Dickson Quality Index (IQD). A fit linear regression and positive correlation was found out between height, collar diameter and dry weight total dry mass with increasing percentages of açaí residue. The substrate composed by 100% of açaí residue provided the highest mean growth of seedlings: height (32.9 cm seedling-1), collar diameter (2.98 mm seedling-1), total dry mass (2.003 g seedling-1), and highest IQD (0.1142). To use with soil, the composition between 25% and 75% of residue also showed possibility.
Prevalence of excess weight and associated factors in adolescents of private schools of an Amazonic urban area, Brazil [Prevalência de excesso de peso e fatores associados em adolescentes de escolas privadas de região urbana na Amazônia]
Silva Junior L.M.,Ufac |
de Souza O.F.,University of Sao Paulo |
Farias E.S.,University of Campinas
Revista Paulista de Pediatria | Year: 2012
Objective: To assess the prevalence and factors associated with excess weight among high school students. Methods: Cross-sectional study with 741 adolescents from private schools in Rio Branco, Acre, Northern Brazil. The weight and height were prospectively measured in order to calculate the body mass index. Overweight was defined according to World Health Organization references in 2007. The following variables were collected: gender, age, socioeconomic status, parental education, number of household members and siblings, physical activity, time watching TV and computer time. Factors associated with excess weight were identified by multiple Poisson regression using the backward elimination procedure for variable selection. Results: The prevalence of overweight was 29.5%. Males showed righer prevalence (33.2%) compared with females (26.4%). As for age, the prevalence was higher at 14 years (40%) in both genders. In the multivariate analysis, adjusted for age and gender, more than two hours in the computer per day and a sedentary lifestyle were associated with excess weight. Conclusions: Excess weight is a serious public health problem in high school students from private institutions of an urban area of the Amazonia Region. The promotion of physical activity and the reduction of time in the computer should be considered as strategies to improve the health of adolescents.
Soares A.A.,Federal University of Lavras |
de Sousa Reis M.S.,EPAMIG |
de Oliveira Cornelio V.M.,EPAMIG |
Leite N.A.,Federal University of Viçosa |
And 4 more authors.
Crop Breeding and Applied Biotechnology | Year: 2013
The basic objective of the upland rice breeding program developed in the state of Minas Gerais is to make new commercial cultivars available. A new cultivar named BRSMG Caçula is being released, with the main traits: earliness, lodging tolerance, grain quality, disease tolerance, and high grain yield.
de Oliveira J.D.,Federal University of Acre |
Dapont E.C.,Federal University of Acre |
de Souza L.M.S.,UFAC |
Ribeiro S.A.L.,Laboratorio Of Fitopatologia
Bioscience Journal | Year: 2012
Seeds are essential components for vegetal propagation and, in this way, seed sanitary quality assumes fundamental importance. The aim was to compare the blotter test and BDA methods to incubate seeds to evaluate sanitary quality, the influence of seed disinfection on sanitary test, emergence and seedling development of Schizolobium amazonicum. For determination of microrganisms associated with seeds were tested the methods of paper filter (blotter test) and medium Potato Dextrose Agar (PDA), with aseptic and non-aseptic seeds. The influence of asepsi were evaluated trough seedling emergence test, speed of seedling emergence and seedling development (length, fresh matter and dry matter of root and shoot). Aspergillus flavus, A. niger, Penicillium griseofulvum, Penicillium sp. and Pestalotiopsis sp. can be associated with parica seeds; PDA method is the most suitable to fungi development on this seeds specie; surface sterilization of seeds reduce microrganisms, assist the sanitary test, not affect seed germination and seedling development, but can be benefic to seedling establishment.
Solino A.J.S.,UFAC |
Ferreira R.O.,UFAC |
Ferreira R.L.F.,UFAC |
Neto S.E.A.,UFAC |
Negreiro J.R.S.,BR 364
Revista Caatinga | Year: 2010
The objective of that work was to evaluate the influence of different soil mulching and doses of organic compost in the culture of the rocket. The experimental design was used in randomized blocks, in splitplot arrangement with four replications. The plot corresponded to the soil mulching (no-tillage with living mulch of Arachis pintoi, living mulch of native weed, straw mulch of native weed and conventional tillage without mulching). The plots represent the doses of organic compost (10, 20 and 30 t ha-1 in the dry compost). The variables analyzed were yield, commercial fresh matter, and dry matter of the aerial part. The dose of 30 t ha-1 provided the largest yield values and commercial fresh mass for the conventional system and straw mulch. The dose 20.49 t ha-1 increased yield and commercial fresh mass for A. pintoi mulch. The dose 20.85 t ha-1 showed greater increase in yield and commercial fresh mass for the live native weed. The tillage and straw mulch presented higher yield values for all the studied doses. The dose of 23.1 t ha-1 it promoted the largest dry mass of the aerial part. The tillage and no-tillage with straw mulch it contributed with the largest dry matter of the aerial part.
Alvares V.S.,Embrapa Acre |
Da Costa D.A.,Brazilian National Council for Scientific and Technological Development |
Viana Felisberto F.A.,Embrapa Acre |
da Silva S.F.,UFAC |
Sudan Madruga A.L.,Embrapa Acre
Revista Caatinga | Year: 2013
The cassava flour is a product known in the Brazil as part of daily meals of the population, mainly in northern and northeastern country. Much of this product is processed by hand, making it difficult to standardize the heterogeneity mainly from the manufacturing processes themselves. In this sense, the physical and chemical attributes of handmade cassava flour sold in Acre, the levels of the Brazilian legislation, were to evaluate. Samples of 20 brands of handmade cassava flour were collected from commercial establishments in Rio Branco, Acre, classified and analyzed for nutrient composition. The results that the flours analyzed, classified as Group Thick and low acidity, are in accordance with the legislation limits for moisture content and starch, but only 10% to be consistent with the actual classification. 25% of the samples were disqualified and 75% were classified as out of type, which implies that the flour trade of Rio Branco are not in accordance with the standards of the current Brazilian legislation.
Delgado R.C.,Federal Rural University of Rio de Janeiro |
de Souza L.P.,UFAC
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2014
The aim of this study was to report physical characterization of the hydrographical basins of Igarapé Canela Fina and Igarapé Preto, both located in the municipality of Cruzeiro do Sul, Acre, Brazil. The ISODATA algorithm was used for the non-supervised classification, drawing on data provided by the TM Landsat 5 sensor from the National Institute for Space Research. The covered period of analysis was from 2005 to 2010. The analysis shows an average increase of 48.11% of deforested areas and a mean reduction of 50.58% in the forested areas for both basins, due to anthropic interventions over those five years. The analysis of physical characteristics shows similarities between the hydrographical basins, with both responding slowly to hydrological events, and thus providing conditions not favourable to flooding. Modifications conducted on the surface of the hydrographical basins along the last few years have, however, possibly altered the hydro dynamics of the rivers and streams. The preliminary results indicate that the Remote Sensing and Geographic Information Systems are efficient tools for the analysis of the space-time dynamics of vegetation and the morphometric characterization of hydrographical basins.
Ribeiro T.H.T.,UFAC |
de Albuquerque T.G.,UFAC |
da Silva D.L.,UFAC |
Oliveira K.C.S.,UFAC |
And 3 more authors.
Adolescencia e Saude | Year: 2012
Objective: To describe excessive consumption of carbonated soft drinks and its association with chronic non-transmittable diseases. Data sources: Scielo, Virtual Health Library and PubMed, among others. Data synthesis: Several studies have reported increased consumption of carbonated soft drinks in general, with signifi cant expansion in the population of Brazil. Personal preferences starting with adults (parents), advertisements and strikingly pleasant fl avors are some aspects that contribute to early consumption of these drinks during childhood, perpetuated in adolescence and adulthood. This type of consumption habit is underpinned by the globalized fast food model, which has been mentioned as a major risk factor for obesity and cardiovascular diseases, among other health problems. Conclusion: Assorted evidence indicates the need to reduce the proportion of carbonated soft drink consumption among children and adolescents, due to the potential health hazards generated at early ages during these stages of life. Educational strategies deployed in families and schools may help prevent this problem.