Recursos de colección

UTL Repository Universidade Técnica de Lisboa (32.124 recursos)

O Repositório Institucional da Universidade Técnica de Lisboa desenvolvido no âmbito do projecto RCAAP. Este repositório destina-se a recolher, preservar e disponibilizar o acesso às publicações científicas e didácticas de seis: Escolas da UTL: Faculdade de Medicina Veterinária, Instituto Superior de Agronomia, Instituto Superior de Economia e Gestão, Instituto Superior de Ciências Sociais e Políticas , Faculdade de Motricidade Humana, Faculdade de Arquitectura. O Instituto Superior Técnico, igualmente Escola Da UTL, tem repositório independente.

ISA - Instituto Superior de Agronomia

Mostrando recursos 1 - 20 de 182

  1. Railway ecology

    Borda-de-Água, Luís; Barrientos, Rafael; Beja, Pedro; Pereira, Henrique M.
    We have divided the book into two parts. The first aims at reviewing the main ideas and methods related to the identification, monitoring, and mitigation of railway impacts on biodiversity, with emphasis on wildlife mortality, barrier effects, biological invasions, and the effects of other railway environmental impacts such as noise and chemical pollution. The second part of the book provides a set of case studies from around the world that illustrate the impacts of railways on wildlife and ways to reduce those impacts. Reflecting the strong interest in the topic of wildlife mortality, four chapters focus on the patterns of mortality resulting from collisions with trains and...

  2. A história do AGROS nos seus cinquenta anos

    Neves, Carlos Manuel Baeta

  3. A obra do Instituto Superior de Agronomia nos últimos vinte e cinco anos

    Gomes, Mário Azevedo

  4. Notícia sobre a Tapada da Ajuda

    Gomes, Mário Azevedo

  5. Water use by a groundwater dependent maize in a semi-arid region of Inner Mongolia: evapotranspiration partitioning and capillary rise

    Wu, Yao; Liu, Tingxi; Paredes, Paula; Duan, Limin; Pereira, L.S.
    tThis study aimed at assessing the soil water balance, groundwater contribution, crop transpiration andsoil evaporation of a rainfed maize crop in Horqin sandy area, north-eastern Inner Mongolia, China.Two years of field data from the Agula site were used, 2008 with relatively high rainfall (363 mm) andhigh water table, and 2009 with low rainfall (125 mm) and lower water table. The SIMDualKc waterbalance model was calibrated with observed soil water content data of 2008 and validated with dataof 2009. The model uses the dual crop coefficient approach for evapotranspiration (ET) partitioning,and parametric functions for computing capillary rise. The respective modelling results...

  6. Texture, microstructure and consumer preference of mango bars jellified with gellan gum

    Danalache, Florina; Beirão-da-Costa, Sara; Mata, Paulina; Alves, Vitor D.; Martins, Margarida Moldão
    Studies for the development of a novel convenient fruit product based on mango puree and gellan gum were carried out. Two gellan types (low acyl-L and high acyl-H) used in specific L/H ratios (75/25, 50/50, 25/75) for an overall concentration of 1 g of gellan/100 g of puree were tested, in order to design different mango bars. The influence of the L/H gellan ratio on their texture properties (TPA and SR tests), microstructure (Cryo-Scanning Electron Microscopy) and texture sensory acceptance (Preference- Ranking test) was studied. The results obtained enabled to separate the bars in two groups: the ones showing greater hardness and brittleness (only L gellan,...

  7. Field assessment of basin irrigation performance and water saving in Hetao, Yellow River basin: issues to support irrigation systems modernisation

    Miao, Qingfeng; Shi, Haibin; Gonçalves, José M.; Pereira, L.S.
    Research Paper

  8. Assessing and modelling water use and the partition of evapotranspiration of irrigated hop (Humulus lupulus) and relations of transpiration with hops yield and alpha-acids

    Fandiño, M.; Olmedo, J.L.; Martinez, E.M.; Valladares, J.; Paredes, P.; Rey, B.J.; Mota, M.; Cancela, J.J.; Pereira, L.S.
    This study was conducted during three seasons (2012–2014) in an experimental hop yard at Mabegondo,Galicia, NW Spain. The research aimed at calibrating and validating the soil water balance model SIMD-ualKc for Humulus lupulus L. cv. ‘Nugget’. The model computes the soil water balance using the dualKcapproach, thus partitioning crop evapotranspiration (ETc) into crop transpiration, ground covertranspiration and soil evaporation. Calibration and validation were performed using TDR soil watercontent measurements, which produced small root mean square errors (RMSE) ranging from 0.012 to0.015 cm3cm−3. The initial, mid-season and end-season basal crop coefficients (Kcb) that allow com-puting hop transpiration were respectively 0.16, 0.97...

  9. Exploring the effect of land use on ecosystem services: the distributive issues

    Lopes, Luís Filipe Gomes; Bento, João Manuel R. dos Santos; Cristovão, Artur F. Arede Correia; Baptista, Fernando Oliveira
    The current debate of ecosystem services has focused more on monetary valuation methods and pay-ments for environmental services (PES) then on the classic economic analysis (i.e. assumptions regarding:sustainability, justice and efficiency). This paper examines, taking into consideration ecosystem services,income distribution from different land uses to stakeholders. We study the Portuguese common landecosystem, which is characterized as having a wide range of ecosystem services. Allowing that all thebenefits can be translated into economic value, we estimated the total economic value (TEV) associatedwith these territories on 5 different land use situations: forest, shrubland, water bodies, mountain agri-culture and other uses, and analyzed...

  10. Avaliação da eficiência das passagens para peixes através de detectores de infravermelhos. Riverwatcher: um caso de estudo

    Pinheiro, Paulo J.; Santos, José M.; Ferreira, M.T.; Bochechas, Jorge
    A eficiência de uma passagem para peixes de bacias sucessivas instalada na mini-hídrica de Janeiro de Cima, no rio Zêzere, foi avaliada utilizando um dispositivo de leitura de infravermelhos, o Riverwatcher. Este aparelho funciona como um “bio-scanner ”, cuja função é a contagem do número de peixes que transpõem os leitores de infravermelhos do dispositivo, registando além de dados ambientais como a temperatura da água, variáveis como o comprimento e silhueta dos peixes. Foram efectuados três ensaios com a intenção de aferir este dispositivo de monitorização, relativamente à contagem e à forma das silhuetas. Constatou-se que o Riverwatcher foi pouco eficaz na monitorização do uso da passagem...

  11. Nutrient removal effectiveness by riparian buffer zones in rural temperate watersheds: the impact of no-till crop practices

    Aguiar Jr., T.R.; Rasera, K.; Parron, L.M.; Brito, A.G.; Ferreira, M.T.
    Riparian buffer zones have the potential to capture chemical contaminants and to mitigate detrimentalside-effects in aquatic ecosystems derived from excess fertilizers used in agro-food production. No-tillfarming systems are well known agricultural practices and are widely used in temperate areas. In thatregard, different settings and widths of riparian buffer zones (12, 24, 36, 48 and 60 m) with woody veg-etation, shrubs or grasses were assessed. The methodology was comprised of the evaluation of a largenumber of experimental sites and the sampling was conducted after the first rain period and respectivefertilizer applications. The results point to the fact that effectiveness is largely...

  12. A paisagem lida pelo movimento. Caso de estudo - Encosta do Restelo

    Gomes, Maria Helena Novais
    Mestrado em Arquitetura Paisagista - Instituto Superior de Agronomia

  13. Potential bio-activity of whey fermented extract as sanitizer of organic grown lettuce

    Santos, M.I.S.; Martins, S.R.; Pedroso, L.; Sousa, I.; Ferreira, M.A.S.S.
    Short Communication

  14. Phytotoxic metabolites from Neofusicoccum parvum, a pathogen of Botryosphaeria dieback of grapevine

    Abou-Mansour, Eliane; Débieux, Jean-Luc; Ramírez-Suero, Montserrat; Bénard-Gellon, Mélanie; Magnin-Robert, Maryline; Spagnolo, Alessandro; Chong, Julie; Farine, Sibylle; Bertsch, Christophe; L'Haridon, Floriane; Serrano, Mario; Fontaine, Florence; Rego, Cecilia; Larignon, Philippe
    Liquid chromatography-diode array screening of the organic extract of the cultures of 13 isolates of the fungus Neofusicoccum parvum, the main causal agent of botryosphaeria dieback of grapevine, showed similar metabolites. One strain was selected for further chemical studies and led to the isolation and characterisation of 13 metabolites. Structures were elucidated through spectroscopic analyses, including one- and two-dimensional NMR and mass spectrometry, and through comparison to literature data. The isolated compounds belong to four different chemical families: five metabolites, namely, ( )-terremutin (1), (+)-terremutin hydrate (2), (+)-epi-sphaeropsidone (3) ( )-4-chloro-terremutin hydrate (4) and(+)-4- hydroxysuccinate-terremutin hydrate (5), belong to the family of dihydrotoluquinones; two metabolites, namely, (6S,7R) asperlin...

  15. Novel mango bars using gellan gum as gelling agent: rheological and microstructural studies

    Danalache, Florina; Mata, Paulina; Martins, Margarida Moldão; Alves, Vitor D.
    This work aimed the development of mango bars, made with fresh mango puree and gellan gum. The influence of gellan concentration as well as the ratio of LA (low-acyl) and HA (high-acyl) gellan on the rheological and microstructural properties of the mango bars was studied. Rheological outcomes showed that both LA and HA, and in mixtures, were able to produce jellified products, within a rather low maturation time. Furthermore, a synergistic effect was observed at different ratios of LA/HA, enabling the production of mango bars with intermediate viscoelastic properties. Higher values of the dynamic moduli were perceived as the LA content increased. Confocal microscopy is in...

  16. Performance assessment of the FAO AquaCrop model for soil water, soil evaporation, biomass and yield of soybeans in North China plain

    Paredes, P.; Wei, Z.; Liu, Y.; Xu, D.; Xin, Y.; Zhang, B.; Pereira, L.S.
    tFour years of soybean experimental data observed at Daxing, North China Plain, were used to assess theability of the AquaCrop model to predict soybean final biomass and yield. The model was parameterizedand calibrated using field data on leaf area index (LAI), available soil water, soil evaporation, biomass andfinal yield data. The model was assessed using calibrated and default parameters. Data on LAI were usedto derive the fraction of ground cover and to calibrate the green canopy cover (CC) curve. An accurate cal-ibration of the CC curve was performed, with low root mean square errors (RMSE < 7.3%). Results relativeto soil...

  17. Modelling soil water dynamics of full and deficit drip irrigated maize cultivated under a rain shelter

    González, Maria G.; Ramos, Tiago B.; Carlesso, Reimar; Paredes, Paula; Petry, Mirta T.; Martins, Juliano D.; Aires, Núbia P.; Pereira, L.S.
    Research Paper

  18. Fe deficiency induction in Poncirus trifoliata rootstock growing in nutrient solution changes its performance after transplant to soil

    Gama, Florinda; Saavedra, Teresa; Díaz, Isabel; Campillo, Maria del Carmen; Varennes, Amarilis de; Duarte, Amílcar; Pestana, Maribela; Correia, José Pedro
    tThe absence of iron (Fe) in the nutrient solution induces several physiological and morphological adapta-tions in the roots of Poncirus trifoliata, a citrus rootstock, thereby modifying its overall nutritional status.Whether these changes are advantageous when plants are transplanted to calcareous soils needs to beassessed. To achieve this objective a two-phase experiment was established, first in nutrient solution(phase I) then in pots containing different soils (phase II). In phase I, P. trifoliata L. Raf. plants were grownin Hoagland’s solution with 120 M of Fe (Fe120 treatment) or without (Fe0 treatment). At the end ofphase I (87 days), Fe-chlorotic plants had less...

  19. Effect of modified atmosphere on polyphenols during storage of pasteurised strawberry purees

    Oliveira, Ana; Alexandre, Elisabete M.C.; Coelho, Marta; Gomes, Maria Helena; Almeida, Domingos P.F.; Pintado, Manuela
    The minimum loss of processed fruit nutritional quality must been guaranteed during storage and the atmosphere can be a limiting step. Strawberry pur ees flushed with gas mixtures: 10 kPa O2 þ 90 kPa N2, 100 kPa N2 and air (78 kPa N2 þ 21 kPa O2 þ 0.03 kPa CO2) were stored for 90 days at 4 and 23 C and revealed no effect in total antioxidant activity and in total phenolic content. The compounds (þ)-catechin, ( )-epicatechin and quercetin-3-rutinoside were not affected by the atmospheres for both temperatures and ellagic acid was the exception within strawberry phytochemicals, where its concentration was higher for samples...

  20. Storage stability of Jatropha curcas L. oil naturally rich in gamma-tocopherol

    Rodrigues, Joana; Miranda, Isabel; Furquim, Leonnardo; Gominho, Jorge; Vasconcelos, Manuel; Barradas, Gonçalo; Pereira, Helena; Bianchi-de-Aguiar, Fernando; Ferreira-Dias, Suzana
    tJatropha curcas L. is an interesting tropical oil crop for biodiesel production. However, seed conservationuntil oil extraction may be a problem under high temperature and humidity. In this study, Jatropha curcasL. seeds grown in Mozambique and presenting 160 mg/kg of gamma-tocopherol in their oil were storedfor 42 days, in dark, at 35◦C and 75% or 92% relative humidity (RH). Along storage, the oil was extractedand analysed in terms of fatty acid composition, tocopherol content, acidity, initial and final oxidationproducts (monitored by K232 and K270 values, respectively).Jatropha seeds presented an initial water content of 8.4% and an oil content of 45.7%...

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