1,649 research outputs found
Produção e absorção de azoto e fósforo em agroecossistemas após a aplicação de resíduos orgânicos de pecuária
Só está disponível o resumo.O objetivo deste trabalho foi o de avaliar o efeito residual da aplicação ao solo de
resíduos orgânicos de pecuária na (i) produção do azevém, (2) absorção de N e P
pelo azevém e (3) perdas de N e P por escoamento superficial. O trabalho decorreu
no campo experimental de erosão hídrica da Escola Superior Agrária de Castelo
Branco, constituído por 18 talhões de 42 m2 cada e com declive de 9. Durante dois
ciclos culturais de azevém (Lolium perenne L.), 2012-2013 e 2013-2014, foi
adicionado o correspondente a 50 kg P/ha ao solo em cada talhão através dos
seguintes fertilizantes: Estrume (M); fração sólida de chorume de suínos (P); fração
sólida de chorume de pato (D); superfosfato (F); controlo, sem adição de P (C). Após o final deste ensaio, no ciclo cultural seguinte em 2014-2015 foi instalado de novo o azevém realizando-se apenas uma fertilização azotada em todas as modalidades numa quantidade de 40 kgN/ha repartido em duas aplicações. Os resultados indicam que a produção e a absorção de N e de P foram significativamente superiores na modalidade que tinha sido fertilizada com estrume (M). A proporção de N absorvido pela cultura relativamente ao total aplicado foi: 62%, 56%, 75%, 78 e 91% nas modalidades C, F, D, S e M respetivamente. A quantidade total de Pi perdido para as águas de escoamento
superficial variou entre 0,084 e 0,012 kg/ha nas modalidades D e M respetivamente, enquanto a quantidade de N-total variou entre 0,15 e 0,015 kg/há nas modalidades F e M. A aplicação de estrume durante dois anos consecutivos resultou em condições de nutrição mais adequadas, que se mantiveram, comparando com os outros resíduos utilizados ou o fertilizante fosfatado. Esta modalidade foi a que proporcionou também menores perdas de N e P para as águas de escoamento superficial.info:eu-repo/semantics/publishedVersio
Regime mapping and the role of the intermediate region in wall-coated microreactors
Operation of a wall-coated microreactor can occur in several mass transfer-reaction regimes. We define these regimes analytically in several planes of a multi-parametric map, taking into account the different degrees of concentration profile development, as well as the influence of non-unity orders of reaction and reactant inhibition in the kinetic law. It was found that the regions where conversion can be calculated from simplified mass transfer models are not discriminated by common results for entrance-length. We also illustrate the trade-offs that exist across this operating map concerning the catalyst design (costs associated with loading and volume) and overall system performance (evaluated in terms of reactant conversion, flow efficiency and microreactor effectiveness). It is shown that under certain conditions, the existence of moderate mass transfer resistance can be advantageous (even if internal limitations cannot be avoided), clarifying the role of the intermediate transport-reaction region
AdS4 flux vacua in type II superstrings and their domain-wall solutions
We investigate the emergence of supersymmetric negative-vacuum-energy ground
states in four dimensions. First, we rely on the analysis of the effective
superpotential, which depends on the background fluxes of the internal
manifold, or equivalently has its origin in the underlying gauged supergravity.
Four-dimensional, supersymmetric anti-de Sitter vacua with all moduli
stabilized appear when appropriate Ramond and Neveu--Schwarz fluxes are
introduced in IIA. Geometric fluxes are not necessary. Then the whole setup is
analyzed from the perspective of the sources, namely D/NS-branes or
Kaluza--Klein monopoles. Orientifold planes are also required for tadpole
cancellation. The solutions found in four dimensions correspond to domain walls
interpolating between AdS4 and flat spacetime. The various consistency
conditions (equations of motion, Bianchi identities and tadpole cancellation
conditions) are always satisfied, albeit with source terms. We also speculate
on the possibility of assigning (formal) entropies to AdS4 flux vacua via the
corresponding dual brane systems.Comment: Acknowledgment replace
Operation of a perfusive catalytic membrane with nonlinear kinetics
Operation of a perfusive catalytic curved membrane is systematized into different transport-reaction regimes. The internal viscous permeation improves the catalyst performance, measured here by the effectiveness factor and by its enhancement relative to purely diffusive conditions. A theoretical analysis is presented for nonlinear kinetic expressions, which are suitable to describe the consumption of a reactant in many (bio)catalytic systems. The kinetic and transport parameters required to attain maximum enhancement are related by simple design rules, which depend on the form of the reaction rate law (namely on the order of reaction and dimensionless inhibition constant). For zero-order reactions, these optimum conditions correspond to attaining negligible concentration at a position inside the membrane, while may be interpreted in general as separating situations of severe mass transfer resistance from cases of high effectiveness. It is important to incorporate the correct form of the kinetic expression in the analysis, so that the predictions can be used in a quantitative manner. The results for the different regimes are compiled in enhancement plots and in Peclet–Thiele diagrams. Moreover, the study also yielded new results for the nonlinear reaction–diffusion problem in a curved membrane with its two surfaces exposed to different concentrations, a case of relevance in membrane reactors
Enrelvamento em vinha de encosta não regada: 2 - efeitos no crescimento vegetativo, produção e qualidade do mosto e vinho, casta Cabernet Sauvignon
Grapevine vegetative growth, yield, fruit composition and wine quality were studied in the Estremadura Winegrowing Region of Portugal in a
‘Cabernet Sauvignon’ slopping non-irrigated vineyard. During three seasons three treatments were compared: soil tillage (control), permanent
resident vegetation, and permanent sown cover crop. When compared to soil tillage, the inter-row sward treatments displayed a lower predawn
leaf water potential from bloom to mid-ripening. These differences in vine water status did not affect vine yield or berry sugar accumulation;
however, in the third season after experiment setup it induced a significant reduction in vegetative growth in the sward treatments, compared
to soil tillage. This vegetative growth reduction had a positive effect on grape composition by reducing titratable acidity and increasing berry
skin total phenols and anthocyanins. Those differences were also detected in the wines by the judges who gave a better classification to the
wines from the sward treatments. Our results indicate that cover cropping can be a valuable tool for controlling vigour and enhancing wine
quality in this winegrowing region
Enrelvamento em vinha de encosta não regada: 1 - efeito na composição e dinâmica das infestantes
The influence of two sward treatments and soil cultivation on the composition, the structure, and the evolution of the biomass of vineyard weed
communities was examined. The 3-year study (2002-2004) was carried out in a sloping, non-irrigated vineyard, cv. ‘Cabernet Sauvignon’, in
the Estremadura winegrowing region of Portugal. The experimental treatments were: soil tillage (control); permanent sown cover crop - Lolium
perenne ‘Nui’, L. multiflorum ‘Bartíssimo’, Festuca ovina ‘Ridu’, F. rubra ssp. rubra ‘Echo’, Trifolium incarnatum. ‘Red’, T. repens ‘Huie’
and T. subterraneum ‘Claire’; and permanent resident vegetation. Total weed biomass in the spring did not reveal significant differences
between treatments, but varied annually. The management practices – e.g. time and number of soil cultivations and inter-row mowing – were
determinant in weed biomass evolution. Canonical correspondence analysis revealed significant treatment effects on community structure.
Three years after the experiment was set up, in the soil tillage treatment weed composition was dominated by annual broad-leaved species,
namely five Geraniaceae species, Medicago polymorpha and Sonchus oleraceus. The perennial broad-leaved species Oxalis pes-caprae was
also a dominant species in soil tillage. In both sward treatments there was an increase in the perennial broad-leaved and grass species. Compared
to soil tillage, in the resident vegetation treatment there was a significant increase in perennial species, such as Rumex crispus, Veronica
anagallis-aquatica and Polypogon monspeliensis, and in the annuals Melilotus indica and Avena sterilis. The increase in these perennial
species, which are considered to compete with vines, requires more frequent mowing in the summer. In the permanent sown cover crop
treatment, L. perenne and T. repens displayed the ability to re-establish successfully, and their abundance decreased or suppressed most of the
annual and perennial weed species
Effects of irrigation on the vigour, yield and berry composition of the red variety Touriga Nacional at the Dão winegrowing region, Portugal
Proceedings - 17 th International Symposium GIESCO, Asti, Italy, 2011In a field trial installed at the Centro de Estudos Vitivinícolas do
Dão, Nelas, Portugal, the effect of three irrigation treatments on
the agronomic behaviour of cv Touriga Nacional (Vitis vinifera L.)
were studied during three growing seasons (2006-2008). Three
irrigation treatments (DI30 - irrigation with 30% of ETc; DI50 -
irrigation with 50% ETc, FI - full irrigation – 100% Etc) were
compared to a control non-irrigated treatment (NI). Compared to
NI, the deficit irrigation treatments (DI30 & DI50) showed no
significant differences on the yield and its components. The full
irrigation treatment induced a significantly higher yield due to a
higher bunch weight, as compared with the others treatments.
Compared to the control, the deficit irrigation treatments presented
similar berry composition during all the three seasons. The FI
treatment presented, in all seasons, a significantly higher total
acidity and a significantly lower Brix and total anthocyanins
concentration as compared to the other treatments. The pruning
weight and shoot weight increased with the amount of irrigation
water applied, but significant differences were found only between
the FI and the NI treatments, the last presenting the lowest values.
Despite the fact that in the non-irrigated vineyards of the Dão
winegrowing region it is very common to observe vine water
stress symptoms, mainly during the ripening period, during the
three studied seasons (2006-2008), the deficit irrigation treatments
showed no advantages relatively to the control non-irrigated.
Despite the higher yield produced in the full irrigation, this
treatment had the disadvantages of the excessive vine vigour and
lower must quality produced
Effect of vineyard floor management practices on water use: A case study at a terroir of the "Dão" winegrowing region in Portugal
Aiming to evaluate the effect of vineyard floor management practices on water use and vine performance, a field
experiment was carried out at the Dão Wine Research Station, located at Nelas, Center Portugal. The experiment
was set up in 2010 in a mature vineyard planted with the red grape variety ‘Touriga Nacional’, using a 2x2 factorial
design with the following treatments: inter-row soil management (permanent resident vegetation vs. soil
tillage) and undervine floor management (mulch vs. herbicide). In this paper it will be presented data from 2013
growing season (four seasons after experiment setup). The volumetric soil moisture, assessed with a capacitance
probe to a 1.5 m depth, showed a decreasing pattern throughout the growing season in all treatments with the
resident vegetation presenting lower values as compared to the tillage treatment, while no significant differences
were observed between the two undervine floor management practices. From budburst to flowering the resident
vegetation treatment showed a higher soil water depletion (up to 1.5 m depth) than the tillage treatment but the
relative situation was reversed during the flowering-veraison period, while no significant differences were observed
during the ripening period. Vine stem water potential values showed a decreasing pattern along the season
attaining very low values during September but with no significant differences between treatments. In general
the soil management practices did not significantly affect vine vigor, yield and berry composition however, since
these results are only from one season, further data analysis in ongoing in order to allow stronger conclusions.info:eu-repo/semantics/publishedVersio
Daily evolution of the components of the balance of radiation of vines in a vineyard in the Dão region
Proceedings - 17 th International Symposium GIESCO, Asti, Italy, 2011In order to validate a model of vine transpiration based on
radiative surface temperature a field trial was conducted in a
vineyard in the Dão region, centre of Portugal, with the cultivar
“Touriga Nacional”. The model is based on the partition of net
radiation between the components of the canopy (vines, soil, and
grass cover), considering that the vines and the undercover (soil
plus grass cover) act separately and in parallel. Thus, the latent
heat flux from the vines to the atmosphere (lTc) is determined
from vine net radiation (Rnc) and sensible heat flux (Hc). The
partition of net radiation (Rn) between the undercover (Rns) and
the vines (Rnc) is made considering the exponential form for
radiation extinction, with the coefficient of extinction being
corrected with a factor dependent on the zenital solar angle (j)
while leaf area index (LAI) is corrected with a clumping factor,
Ω(φ). Sensible heat flux from the vines (Hc) is calculated from
radiative temperature (Tc) considering that the fluxes from the
different origins are independent and that there are two resistances
in series between the canopy and the atmosphere: the leaf
boundary layer resistance (raHc) and the aerodynamic resistance of
the crop (raH). Besides the estimation of the daily values of
transpiration, the model allows to study the evolution of the
different components of the radiation balance throughout the day.
The daily evolution of the evaporation fraction from the vines
(FEc) can be approximated by a concave curve. Values of FEc > 1
show that, under certain circumstances and periods of the day,
energy used for transpiration (lTc) is greater than crop net
radiation, which indicates that there are exchanges of energy
between the several components of the surface, namely when
evaporative demand from the atmosphere is high and there are no
soil water restrictions. The model also shows that, regardless of the
soil water status, transpiration is a big part of Rn when these values
are low (in the beginning of the morning and late afternoon)
Caged Gammarus fossarum (crustacea) as a robust tool for the characterization of bioavailable contamination levels in continental waters. Toward the determination of threshold values
We investigated the suitability of an active biomonitoring approach, using the ecologically relevant species Gammarus fossarum, to assess trends of bioavailable contamination in continental waters. Gammarids were translocated into cages at 27 sites, in the Rhône-Alpes region (France) during early autumn 2009. Study sites were chosen to represent different physico-chemical characteristics and various anthropic pressures. Biotic factors such as sex, weight and food availability were controlled in order to provide robust and comparable results. After one week of exposure, concentrations of 11 metals/metalloids (Cd, Pb, Hg, Ni, Zn, Cr, Co, Cu, As, Se and Ag) and 38 hydrophobic organic substances including polycyclic aromatic hydrocarbons (PAHs), polychlorobiphenyles (PCBs), pentabromodiphenylethers (PBDEs) and organochlorine pesticides, were measured in gammarids. All metals except Ag, and 33 organic substances among 38 were quantified in G. fossarum, showing that this species is relevant for chemical biomonitoring. The control of biotic factors allowed a robust and direct inter-site comparison of the bioavailable contamination levels. Overall, our results show the interest and robustness of the proposed methodological approach for assessing trends of bioavailable contamination, notably for metals and hydrophobic organic contaminants, in continental waters. Furthermore, we built threshold values of bioavailable contamination in gammarids, above which measured concentrations are expected to reveal a bioavailable contamination at the sampling site. Two ways to define such values were investigated, a statistical approach and a model fit. Threshold values were determined for almost all the substances investigated in this study and similar values were generally derived from the two approaches. Then, levels of contaminants measured in G. fossarum at the 27 study were compared to the threshold values obtained using the model fit. These threshold values could serve as a basis for further implementation of quality grids to rank sites according to the extent of the bioavailable contamination, with regard to the applied methodology
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