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Ioannis?GravalosEmail author Anastasios?Georgiadis Dimitrios?Kateris Theodoros?Gialamas Evagelos?Bompolas Zisis?Tsiropoulos Avgoustinos?Avgoustis Panagiotis?Xyradakis 《Precision Agriculture》2017,18(1):19-36
This research is a study on the relationship of irrigation water treatments and soil moisture distribution uniformity (DU). Soil moisture distribution was based on long-term data sets that were collected using a novel electromagnetic sensor-based platform moving inside sub-surface horizontal access-tubes. The research was conducted under controlled laboratory conditions in a soil tank. The irrigation treatments regarding two case studies under dry and wet soil conditions (from permanent wilting point to field capacity) were conducted for a period of 115 and 110 days respectively. In dry soil conditions, the irrigation water treatments strongly affect the DU of soil moisture that can be achieved constantly using non-uniform irrigation treatments. In contrast, the DU of soil moisture in wet soil conditions was maintained at a high percentage and was slightly affected by irrigation treatments. However, obtaining accurate soil moisture information at a large scale over a long period can be used to improve water use efficiency. 相似文献
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Agalias A Magiatis P Skaltsounis AL Mikros E Tsarbopoulos A Gikas E Spanos I Manios T 《Journal of agricultural and food chemistry》2007,55(7):2671-2676
The high polyphenol content of the wastewater is the major environmental problem caused by the olive mills. A pilot scale system for the treatment of the olive oil mills wastewater was developed aiming at the recovery of high added value-contained polyphenols and the reduction of the environmental problems. The treatment system consists of three main successive sections: The first one includes successive filtration stages aiming at the gradual reduction of the wastewater suspended solids up to a limit of 25 microm. The second section includes passing of the filtered wastewater through a series of adsorbent resins (XAD16 and XAD7HP) in order to achieve the de-odoring and decolorization of the wastewater and the removal/ recovery of the polyphenol and lactone content. The third section of the procedure includes the thermal evaporation and recovery of the organic solvents mixture, which has been used in the resin regeneration process, and finally the separation of the polyphenols and other organic substance contents using fast centrifuge partition chromatography. The final outcome of the whole procedure is (i) an odorless yellowish wastewater with a 99.99% reduced content in polyphenols and 98% reduced COD, (ii) an extract rich in polyphenols and lactones with high antioxidant activity and high added value, (iii) an extract containing the coloring substances of the olive fruit, and (iv) pure hydroxytyrosol. 相似文献
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Vassos Vassiliou Marios Charalambides Michalis Menicou Niki Chartosia Eftihia Tzen Binopoulos Evagelos 《Aquaculture Economics & Management (Blackwell Science)》2013,17(4):423-443
Fish feed accounts for more than 50% of aquaculture farms’ operating costs and thus careful feeding planning is vital. In the case of the Mediterranean, most farms have their installations in coastal waters, hence this is relatively easy to perform. Low magnitude environmental conditions (winds, waves and currents) as well as easy and quick access ensures high consumption rates and smooth operation. Nevertheless, as competition for these waters increases the option of moving to offshore waters is seen as a solution. Moving further away from shore means exposing installations to harsher environments and lower degree of onshore monitoring. As a result, environmental conditions must now be monitored on-site, especially the ones affecting operations and feeding planning. For this reason, this article presents a feed management system powered by a stand-alone renewable energy sources system. The system provides energy independence and mobility by wirelessly transmitting important parameters onshore. An investment appraisal cost model is also described. The model compares the system’s costs over the fish feed cost saved by a priori feeding planning through better monitoring of on-site conditions. It concludes that such synergies have profitable potentials. 相似文献
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Chrysanthi Charatsari Evagelos D. Lioutas 《Journal Of Agricultural & Food Information》2013,14(2):103-131
In this article we present and discuss two experiments designed to test the effectiveness of the Internet as a tool of agricultural information. Subjects were cotton producers from Thessaly, Greece. Findings suggest that, in the early stages of an innovation diffusion process, the Internet is more effective than social sources (Experiment 1). However, when urgent situations that force quick decisions occur (Experiment 2), the Internet is significantly less effective than face-to-face communication channels. In both cases, farmers who used the Internet spent more time and devoted extra effort. The experiments proved that agronomists remain the most effective information source. Results also illustrate that Internet adoption is not necessarily synonymous with its use. 相似文献
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Evagelos D. Lioutas 《Journal Of Agricultural & Food Information》2014,15(2):81-108
This article draws from general and specific literature to present the way food consumer information behavior is executed from the stage of information need recognition to that of information use. Information needs are derivative needs, which originate from primary (physiological or psychological) needs. After need arousal, the consumer starts seeking food information by using one or more of the available out-of-store (published material, media, experts, institutional bodies, and social milieu) or in-store (store personnel, food labels) information sources. The information gathered is evaluated and, when it is judged insufficient in terms of quantity and/or quality, the consumer continues to seek information by following other paths. Simultaneously and/or subsequently, the information is refined, processed, and translated into different behavioral responses. The article concludes by highlighting some open issues and by proposing new research directions. 相似文献
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Papadopoulos N Gikas E Zalidis G Tsarbopoulos A 《Journal of agricultural and food chemistry》2007,55(18):7270-7277
A method based on high-performance liquid chromatography with diode-array detection was developed and validated aiming at the simultaneous determination of terbuthylazine (TER) and its five major metabolites, desisopropyl-hydroxy-atrazine, desethyl-hydroxy-terbuthylazine, desisopropyl-atrazine, hydroxy-terbuthylazine, and desethyl-terbuthylazine. Although s-triazines are used worldwide as herbicides for agricultural and nonagricultural purposes, there is limited information on the environmental impact of TER degradation products. The proposed method includes a solid-phase extraction procedure (using MCX cartridges) with adequate recovery efficiency (70-80%). The statistical evaluation of the method reveals good linearity, accuracy, and precision for the compounds determined, with RSD values less than 14.6%, while the detection limit was found to be 0.05 microg L(-1) for DIHA and 0.01 microg L(-1) for the other substances. This method can be employed in biodegradation studies of TER and its metabolites in water samples from constructed wetlands, thus assisting the evaluation of their environmental impact. 相似文献
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Chrysanthi Charatsari Alex Koutsouris Evagelos D. Lioutas Apostolos Kalivas Eleni Tsaliki 《Journal Of Agricultural & Food Information》2018,19(1):66-74
Farmer field schools (FFS) represent an alternative lifelong learning approach aimed at enhancing farmers' competences and skills through nonformal education. In this study we examined if farmers' participation in FFS is motivated by their social-psychological needs and whether these needs can be fulfilled through participation in FFS. Findings revealed that the possibility to participate in FFS is higher for farmers who experience lower levels of closeness and connectedness with their community peers and for those who score low on belongingness satisfaction. Furthermore, our analysis confirmed that FFS attendance increases felt community acceptance and facilitates the satisfaction of the belongingness need. 相似文献
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Evagelos Dimitriou George Katselis Dimitrios K Moutopoulos Constantin Akovitiotis & Constantin Koutsikopoulos 《Aquaculture Research》2007,38(4):398-408
More than 25% of Greek fish farms and 20% of Greek hatcheries of gilthead sea bream (Sparus aurata) and sea bass (Dicentrarchus labrax) are located along the Western Hellenic coast. The part of sea bream production is about 60% of the total production of these species. During the last decade, a spectacular increase in both the number of farms and their production, accompanied by a substantial price decrease and modification of their structure and functioning, has been recorded. These changes resulted in the maintenance in cages of large individuals (more than 500 g) of gilthead sea bream which are potential spawners. The study, based on both the maturity stage and the decrease in individual mean weights during the reproductive period of the species, confirmed reproduction in cages. In parallel, during the last 5 years a remarkable increase (about 80%) in sea bream landings from the fish trap fisheries of the Messolonghi‐Etoliko lagoon, which is a typical nursery for the species, was recorded. The increase was accompanied by a decrease both in price and mean size of the 0‐group individuals. The possible influence of the rearing activities in the area, the density‐dependent mechanisms and the negative impacts of this unintentional enhancement of the traditional lagoon fisheries of the area are discussed. 相似文献
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