509 research outputs found
Deo Altissimo
No full textĠabra ta’ poeżiji u proża li tinkludi: Presepju ta’ Tfuliti ta’ Dun Karm – Lil Mikiel Anton Vassalli ta’ A. Cremona – Lil Rosario Briffa ta’ Giorgio Pisani – Rmied ta’ Dun Karm – L-Ewwel Tqarbina – L-Ewwel Quddiesa ta’ Dun Karm – Deo Altissimo ta’ C. V.N/
SIMULATION OF HERBICIDE CONTAMINATION OF THE AQUIFER NORTH OF VICENZA (NORTHEAST ITALY)
No full textThe contamination of the aquifer north of Vicenza (North-East Italy) by atrazine, simazine and alachlor has been simulated developing a simple model based on the fugacity model. The simulation has been carried out taking into account the period 1964–1990 and the results have been compared with the analytical data of the period 1987–1990.
The median concentration (C50) of atrazine measured in the aquifer was 0.028, 0.044 and 0.015 μg/l in 1987, 1988 and 1989–1990 respectively. The simulated values showed a satisfactory behaviour of the model concerning the order of magnitude of the phenomenon. Similar results have been obtained for simazine and alachlor
Terbuthylazine contamination of the aquifer north of Vicenza (North-East Italy)
No full textBackground and Goal. Agricultural practices can affect the quality of aquifers given that they are often located in cropped areas, so significant amounts of pesticides can be found in the water. In particular, triazine herbicides are always carefully checked by the official monitoring systems. The goal of this study was to find the mean concentration of terbuthylazine in an Italian aquifer and to set up a mass balance of this compound.
Methods. Terbuthylazine concentrations in the aquifer were measured in various check-wells during 1998-2004, and the value of censored data were estimated using a Gompertz inverse in order to evaluate the overall mean concentration. The total terbuthylazine load in the recharge area was calculated on the basis of surveys of cropped land and the main weed control techniques applied in the area. Data on aquifer water balance were obtained from previous studies.
Results and Discussion. The herbicide terbuthylazine applied in the recharge zone can be transported by surface water and enter the aquifer. Detected concentrations were always well below the EU drinking water limit and the fraction that can reach the groundwater under normal cropping practices is small, very likely less than 0.2%.
Recommendations and Outlook. The use and application rates of pesticides should be strictly regulated in recharge areas. Vegetated buffer strips can mitigate the impact of herbicides on surface water through reducing drift and early-spring runoff. Attention should also be paid to the fate of the main metabolites from soil biochemical processes
Organic substances based phenols stimulate phenylpropanoid metabolism in Zea mays L.
No full textIntensive land use may affect soil properties (e.g., decreased soil organic matter [SOM] content)
and, consequently, reduce crop yields considerably. One way of counteracting the loss of SOM
and stimulating plant productivity could be the use of organic residues from agro-industrial processes
as bioactive products. The present study was focused on the possible effects of phenolcontaining
organic substances derived from agro-industrial by-products on maize (Zea mays L.)
metabolism in a pot experiment. Plants were grown for 12 d in a nutrient solution in the absence
(control) or in the presence of either a cellulosolitic dry apple hydrolyzate (AP) or a dry blueberry
cool extract (BB) applied at two rates (0.1 and 1mL L–1). Both products increased root and leaf
biomass and led to higher concentrations of macronutrients in the plant tissue. AP and BB also
had a positive impact on nitrogen (N) metabolism stimulating the activity and gene expression of
phenylalanine ammonia-lyase, a key enzyme of the phenylpropanoid pathway. Furthermore,
both products increased leaf concentrations of phenols (+ 28% and 49% for AP and BB, respectively)
and flavonoids (+ 22% and 25% for AP and BB, respectively). From our results it can be
assumed that residues from agro-industry may be successfully used as bioactive products in
agriculture to increase plant yield and resistance to stress conditions
MONITORAGGIO ELETTRICO AD ALTA RISOLUZIONE PER LO STUDIO DELLE PROPRIETA' DI TRASPORTO IN UN ACQUIFERO SUPERFICIALE
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Underground marble quarrying in the Alpi Apuane, M.te Altissimo
No full textMarble quarrying activities throughout the Alpi Apuane area in the northern Apennines are famous and worldwide known, and nowdays during the technical-economic planning must also be considered the environmental impact of the quarrying. Keeping this in mind the Centro di GeoTecnologie and Soc Henraux S.p.a. are putting forward a feasibility study of underground marble quarrying near the M. Altissimo in the central Alpi Apuane. The major advantage of this quarrying method it is the possibilitiy to reach underground large volumes of white marble without large modification of landscape
Il controllo della vegetazione spontanea nelle aree urbane: aspetti agronomici ed ecotossicologici
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