1,721,069 research outputs found
Irrigation automation with heterogeneous vegetation: the case of the Padova botanical garden
No full textAn automated automated control system was set up in the Padova Botanical Garden integrating the information on the soil water status supplied by TDT (Time Domain Transmissometry) sensors with the aid of an irrigation microcomputer. The automatic system consisted of four parts: a) an irrigation network and electronic control unit (microcomputer); b) a monitoring system of the soil moisture and water table depth; c) a management software; d) a datalogger connecting sensors to the irrigation microcomputer. Sensors were chosen so that they could be remotely connected through cabling over more than 100 m, guaranteeing adequate accuracy and high reliability over time. To take into account the heterogeneity of plant cover, the site was divided into six irrigation macro-sectors managed separately by the automated system. These macro-sectors were selected by classifying the area on the basis of water requirements, cover type and evapotranspiration demand. The software allowed different irrigation criteria to be defined, considering the values supplied by the moisture sensors singly or on average. In the first year, the automation worked adequately, allowing the irrigation to be managed on the basis of defined thresholds. The irrigation criterion used in the first year for the automated management within macro-sectors, although allowing a favourable water potential to be maintained on average, does not appear to have adequately evaluated the variability of behaviour of the different plants
L’influenza della macroporosità sulla dinamica dell’acqua e dei soluti nel terreno: I Alcuni richiami teorici
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Municipal wastewater treatment with vertical flow constructed wetlands for irrigation reuse
No full textThe treatment effect of two pilot-scale vertical flow constructed wetlands (VFCWs) on municipal wastewaters and their suitability for irrigation reuse were evaluated in a 2-year (2002-2003) experiment. One VFCW was planted with Typha latifolia and the other with Phragmites australis. VFCW efficiency was evaluated in terms of both mass removal and water quality improvement, considering the following parameters: pH, electrical conductivity (EC(w)), total suspended solids (TSS), chemical oxygen demand (COD) and biochemical oxygen demand (BOD), total nitrogen (TN) and nitrate (NO(3)(-)), total phosphorus (TP) and orthophosphate (PO(4)(3-)), sodium (Na), potassium (K), magnesium (Mg) and calcium (Ca). The accumulation of the elements in the plant organs and VFCW sandy surface layer and their offtake with the macrophyte harvest were also measured. In quantitative terms the established VFCWs showed higher removal efficiencies (>86%) for COD, BOD, N and K, while lower efficiencies (65%) due to the massive growth, The results were less favourable in terms of water quality, because the high evapotranspiration losses counteracted the depuration process by concentrating the elements in the outflow water. Higher concentrations were found in outflow than inflow, especially of Na (relative increase of 89%) and Mg (relative increase of 74%). Only parameters with high removal efficiencies fulfilled the Italian guidelines for irrigation reuse whereas parameters with lower efficiencies (e.g., TSS, TP) limited the potential water reuse. Efficient pre-cleaning systems or innovative integrated systems are thus necessary to obtain high removal efficiencies that reduce the effect of ET on water qualit
Integrazione modelli-GIS per la stima della evapotraspirazione all'Orto botanico di Padova
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L'analisi multicriterio dei sistemi colturali/Multicriteria analysis of the cropping systems
No full textMappatura del rischio di inquiamento: individuazione di aree di generazione dei rilasci di nutrienti nella Pianura Padana
No full textApplicazione del metodo CRL per la gestione delle deiezioni zootecniche nella Bassa Provincia di Venezia
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