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Dr. Chris Cavalaris is Laboratory Teaching Staff specialized on Agricultural Engineering at the Department of Agriculture, Crop Production & Rural Environment - University of Thessaly. He has an over 25 years’ experience on Sustainable Farm Mechanization by being involved in numerous national and international projects related with Precision Agriculture, Soil and water conservation, Climate change mitigation, Farm spraying, Farm machinery management, Biomass and biofuels production, Health and Safety in Agriculture. Recently he is focused in UAV remote sensing having also a UAV pilot C license. He is president of the Hellenic Association for Promotion of Conservation Agriculture – HACA, board member of the European Conservation Agriculture Federation (ECAF) and until recently, board member of the Hellenic Society of Agricultural Engineers.
In this study, a modelling approach for the estimation/prediction of wheat yield based on Sentinel-2 data is presented. Model development was accomplished through a two-step process: firstly, the capacity of Sentinel-2 vegetation indices (VIs) to follow plant ecophysiological parameters was established through measurements in a pilot field and secondly, the results of the first step were extended/evaluated in 31 fields, during two growing periods, to increase the applicability range and robustness of the models. Modelling results were examined against yield data collected by a combine harvester equipped with a yield-monitoring system. Normalized Difference Vegetation Index (NDVI) and Enhanced Vegetation Index (EVI) were examined as plant signals and combined with Normalized Difference Water Index (NDWI) and/or Normalized Multiband Drought Index (NMDI) during the growth period or before sowing, as water and soil signals, respectively. The best performing model involved the EVI integral for the 20 April–31 May period as a plant signal and NMDI on 29 April and before sowing as water and soil signals, respectively (R2 = 0.629, RMSE = 538). However, model versions with a single date and maximum seasonal VIs values as a plant signal, performed almost equally well. Since the maximum seasonal VIs values occurred during the last ten days of April, these model versions are suitable for yield prediction.
Chris Cavalaris; Sofia Megoudi; Maria Maxouri; Konstantinos Anatolitis; Marios Sifakis; Efi Levizou; Aris Kyparissis. Modeling of Durum Wheat Yield Based on Sentinel-2 Imagery. Agronomy 2021, 11, 1486 .
AMA StyleChris Cavalaris, Sofia Megoudi, Maria Maxouri, Konstantinos Anatolitis, Marios Sifakis, Efi Levizou, Aris Kyparissis. Modeling of Durum Wheat Yield Based on Sentinel-2 Imagery. Agronomy. 2021; 11 (8):1486.
Chicago/Turabian StyleChris Cavalaris; Sofia Megoudi; Maria Maxouri; Konstantinos Anatolitis; Marios Sifakis; Efi Levizou; Aris Kyparissis. 2021. "Modeling of Durum Wheat Yield Based on Sentinel-2 Imagery." Agronomy 11, no. 8: 1486.
A three-year study, designed to record the level of potentially toxic elements within the urban complex in the city of Volos, Greece, was carried out between 2018 and 2020. For the needs of the aforementioned study, 62 surface (0–15 cm) soil samples were collected each year (i.e., 186 samples in total) from an urban area of 3.65 km2, and the average value of pseudo-total metal concentration was measured. Soil pollution indices, such as the contamination factor (CF) and the geo-accumulation index (Igeo), were estimated regarding each of the metals of interest. The respective thematic maps were constructed, and the spatial variability of the contamination degree was displayed. Higher values of the CF and Igeo were obtained near the heavy traffic roads and beside the railway station, the bus stations, and the commercial port. The maps based on the pollution indices, along with the database that was constructed using the appropriate mathematical tools of geostatistical analysis, may be a useful tool for monitoring, prediction, and continuous verification of contamination in the urban soils of Volos city.
Evangelia Golia; Sotiria Papadimou; Christos Cavalaris; Nikolaos Tsiropoulos. Level of Contamination Assessment of Potentially Toxic Elements in the Urban Soils of Volos City (Central Greece). Sustainability 2021, 13, 2029 .
AMA StyleEvangelia Golia, Sotiria Papadimou, Christos Cavalaris, Nikolaos Tsiropoulos. Level of Contamination Assessment of Potentially Toxic Elements in the Urban Soils of Volos City (Central Greece). Sustainability. 2021; 13 (4):2029.
Chicago/Turabian StyleEvangelia Golia; Sotiria Papadimou; Christos Cavalaris; Nikolaos Tsiropoulos. 2021. "Level of Contamination Assessment of Potentially Toxic Elements in the Urban Soils of Volos City (Central Greece)." Sustainability 13, no. 4: 2029.
A three-year experiment was carried out in Central Greece to assess the use of different tillage practices (Conventional, Reduced, and No tillage) for seedbed preparation, in a double cropping per year rotation of irrigated and rainfed energy crops for biomass production for first- and second-generation biofuel production. A life cycle assessment (LCA) study was performed for the first year of crop rotation to evaluate the environmental impact of using different tillage practices, identifying the processes with greater influence on the overall environmental burden (hotspots) and demonstrating the potential environmental benefits from the land management change. LCA results revealed that fertilizer application and diesel fuel consumption, as well as their production stages, were the hot-spot processes for each treatment. In the present study, different tillage treatments compared using mass- and area-based functional unit (FU), revealing that reduced tillage, using strip tillage for spring crop and disc harrow for winter crops, and no tillage treatment had the best environmental performance, respectively. Comparison between the prevailing in the area monoculture cotton crop with the proposed double energy crop rotation adopting conservation tillage practices, using mass and energy value FU, showed that cotton crop had higher environmental impact.
Anna Vatsanidou; Christos Kavalaris; Spyros Fountas; Nikolaos Katsoulas; Theofanis Gemtos. A Life Cycle Assessment of Biomass Production from Energy Crops in Crop Rotation Using Different Tillage System. Sustainability 2020, 12, 6978 .
AMA StyleAnna Vatsanidou, Christos Kavalaris, Spyros Fountas, Nikolaos Katsoulas, Theofanis Gemtos. A Life Cycle Assessment of Biomass Production from Energy Crops in Crop Rotation Using Different Tillage System. Sustainability. 2020; 12 (17):6978.
Chicago/Turabian StyleAnna Vatsanidou; Christos Kavalaris; Spyros Fountas; Nikolaos Katsoulas; Theofanis Gemtos. 2020. "A Life Cycle Assessment of Biomass Production from Energy Crops in Crop Rotation Using Different Tillage System." Sustainability 12, no. 17: 6978.
Soil structure is of great importance for a number of other related properties and agricultural management affects it. Under semiarid climatic conditions, soil water for crop growth is particularly important and water retention characteristics are highly dependent on soil structure. Soil physical properties relevant to infer structure were examined along with some basic parameters in a Greek long-term experiment (Thesustill). The objectives of this study were the impacts of tillage system (conventional, reduced and no-till) and crop residue management (removed or remaining) in a sandy clay loam on the functionality of the pore network. Soil organic carbon content and aggregate stability increased with reduction in soil disturbance and greater inputs of organic material. Dexter-n, representing the amount of organic carbon not complexed with clay, which controls soil physical behaviour, improved with addition of crop residues and even more so with reduction in tillage intensity. No-till had a negative impact on soil bulk density and penetration resistance, water retention was increased between pF 1.5 to 4.2. A major result was that reduced tillage was most beneficial in terms of plant available water, also the pore network and its connectivity improved as indicated by gas diffusion results. No-till had far lower air-filled porosities at comparable matric potentials than tilled soils, but diffusivities were high, suggesting well-connected pipe-like pores. Results were unaffected by textural variability. Reduced tillage overall is the most promising option, the impact of residue management likely needs more time to induce the expectable improvements.
Marie Eden; Jörg Bachmann; Chris Cavalaris; Sofia Kostopoulou; Markela Kozaiti; Jürgen Böttcher. Soil structure of a clay loam as affected by long-term tillage and residue management. Soil and Tillage Research 2020, 204, 104734 .
AMA StyleMarie Eden, Jörg Bachmann, Chris Cavalaris, Sofia Kostopoulou, Markela Kozaiti, Jürgen Böttcher. Soil structure of a clay loam as affected by long-term tillage and residue management. Soil and Tillage Research. 2020; 204 ():104734.
Chicago/Turabian StyleMarie Eden; Jörg Bachmann; Chris Cavalaris; Sofia Kostopoulou; Markela Kozaiti; Jürgen Böttcher. 2020. "Soil structure of a clay loam as affected by long-term tillage and residue management." Soil and Tillage Research 204, no. : 104734.
Chris Cavalaris. Farklı gübre uygulama normlarında ayçiçeği ve mısır bitki örtüsünün lidar ve ya. Journal of Agricultural Faculty of Gaziosmanpasa University 2017, 34, 81 -90.
AMA StyleChris Cavalaris. Farklı gübre uygulama normlarında ayçiçeği ve mısır bitki örtüsünün lidar ve ya. Journal of Agricultural Faculty of Gaziosmanpasa University. 2017; 34 (2017):81-90.
Chicago/Turabian StyleChris Cavalaris. 2017. "Farklı gübre uygulama normlarında ayçiçeği ve mısır bitki örtüsünün lidar ve ya." Journal of Agricultural Faculty of Gaziosmanpasa University 34, no. 2017: 81-90.
Chris Cavalaris. Sıra arası mesafenin tatlı sorgumun gelişimi, verimi ve kalite parametreleri üze. Journal of Agricultural Faculty of Gaziosmanpasa University 2017, 34, 229 -237.
AMA StyleChris Cavalaris. Sıra arası mesafenin tatlı sorgumun gelişimi, verimi ve kalite parametreleri üze. Journal of Agricultural Faculty of Gaziosmanpasa University. 2017; 34 (2017):229-237.
Chicago/Turabian StyleChris Cavalaris. 2017. "Sıra arası mesafenin tatlı sorgumun gelişimi, verimi ve kalite parametreleri üze." Journal of Agricultural Faculty of Gaziosmanpasa University 34, no. 2017: 229-237.
Measuring soil compaction is a factor of interest to monitor soil fertility, which plays an important role in crop production cycle. Soil penetration resistance is the most commonly used method to measure soil compaction. It is fast and simple although it presents important limitations due to its close relationship with soil water content and the existence of high variability in the field, which requires increased number of samples that is effort demanding and time consuming. In this work, a fast and robust 5-point penetration resistance system was developed attached on the tractor three point hitch using load cells and combined with a GPS receiver. An ultrasonic sensor to monitor the penetrating depth was also attached. A software program using Microsoft Visual Basic was developed for data acquisition. Security pins and software alarm was added to secure the equipment safety when stones or soil harder than a limit was encountered. The system was successfully tested in an experimental field, where five tillage methods were studied, including no tillage. The results indicated the system's ability to recognize compacted soil layers and depict the spatial variability.
Spyros Fountas; Dimitrios S. Paraforos; Chris Cavalaris; Christos Karamoutis; Theofanis A. Gemtos; Nawaf Abu-Khalaf; Aristotelis Tagarakis. A five-point penetrometer with GPS for measuring soil compaction variability. Computers and Electronics in Agriculture 2013, 96, 109 -116.
AMA StyleSpyros Fountas, Dimitrios S. Paraforos, Chris Cavalaris, Christos Karamoutis, Theofanis A. Gemtos, Nawaf Abu-Khalaf, Aristotelis Tagarakis. A five-point penetrometer with GPS for measuring soil compaction variability. Computers and Electronics in Agriculture. 2013; 96 ():109-116.
Chicago/Turabian StyleSpyros Fountas; Dimitrios S. Paraforos; Chris Cavalaris; Christos Karamoutis; Theofanis A. Gemtos; Nawaf Abu-Khalaf; Aristotelis Tagarakis. 2013. "A five-point penetrometer with GPS for measuring soil compaction variability." Computers and Electronics in Agriculture 96, no. : 109-116.