DSpace Community:http://hdl.handle.net/10174/112024-03-29T01:17:16Z2024-03-29T01:17:16ZUsing a Non-Contact Sensor to Delineate Management Zones in Vineyards and Validation with the Rasch ModelMoral, Francisco J.Rebollo, Francisco J.Serrano, Joãohttp://hdl.handle.net/10174/361372024-01-18T10:49:56Z2023-11-01T00:00:00ZTitle: Using a Non-Contact Sensor to Delineate Management Zones in Vineyards and Validation with the Rasch Model
Authors: Moral, Francisco J.; Rebollo, Francisco J.; Serrano, João
Editors: Somsubhra, Chakraborty
Abstract: The production of high-quality wines is one of the primary goals of modern oenology. In
this regard, it is known that the potential quality of a wine begins to be determined in the vineyard,
where the quality of the grape, initially, and later that of the wine, will be influenced by the soil
properties. Given the spatial variability of the fundamental soil properties related to the potential
grape production, such as texture, soil organic matter content, or cation exchange capacity, it seems
that a uniform management of a vineyard is not the most optimal way to achieve higher grape
quality. In this sense, the delineation of zones with similar soil characteristics to implement site specific management is essential, reinforcing the interest in incorporating technologies and methods
to determine these homogeneous zones. A case study was conducted in a 3.3 ha vineyard located
near Évora, south of Portugal. A non-contact sensor (DUALEM 1S) was used to measure soil
apparent electrical conductivity (ECa) in the vineyard, and later, a kriged ECa map was generated.
ECa and elevation maps were utilised to delineate homogeneous zones (management zones, MZs)
in the field through a clustering process. MZs were validated using some soil properties (texture;
pH; organic matter—OM; phosphorous—P2O5; potassium—K2O; the sum of the exchange bases—
SEB; and cation exchange capacity—CEC), which were determined from 20 soil samples taken in
the different MZs. Validation was also performed using Rasch measures, which were defined based
on the formulation of the objective and probabilistic Rasch model, integrating the information from
the aforementioned soil properties at each sampling location. The comparison of the MZs was more
evident with the use of the Rasch model, as only one value was to be employed in each MZ. Finally,
an additional validation was conducted using a vegetation index to consider the plant response,
which was different in each MZ. The use of a non-contact sensor to measure ECa constitutes an
efficient technological tool for implementing site-specific management in viticulture, which allows
for the improvement of decision-making processes by considering the inherent spatial variability of
the soil.2023-11-01T00:00:00ZSustainability of the extensive livestock production: The role of precision agriculture in Mediterranean Montado ecosystemSerrano, JoãoShahidian, ShakibMarques da Silva, Joséhttp://hdl.handle.net/10174/361282024-01-18T10:47:16Z2024-01-04T00:00:00ZTitle: Sustainability of the extensive livestock production: The role of precision agriculture in Mediterranean Montado ecosystem
Authors: Serrano, João; Shahidian, Shakib; Marques da Silva, José
Editors: R. Shamshiri, Redmond
Abstract: Grassland ecosystems are one of the most common land use types worldwide. The
sustainability of extensive livestock production systems requires the optimization of soil management, pasture production and animal grazing. Montado is an agro-silvo-pastoral system characterized by a high complexity as a result of the interactions between climate, soil, pasture, trees and animals. It is in this highly unpredictable context that dynamic
management decisions have to be made, for example with respect to soil fertilization or pH correction, grazing or animal supplementation. This study shows, through case studies, the potential of the application of Precision Agriculture (PA) strategies and technologies for monitoring indicators of the Mediterranean Montado multifunctional ecosystem, specific
environmental results, namely on soil health and functionality or pasture productivity,
quality, or biodiversity, in a holistic and sustainable approach. The use, calibration and validation of soil and pasture proximal sensors, animal GPS (global positioning system) receivers and satellite images opens perspectives to explore new solutions to respond to the new economic and environmental challenges and ensures the resilience of this ecosystem.2024-01-04T00:00:00ZMontado Mediterranean Ecosystem (Soil–Pasture–Tree and Animals): A Review of Monitoring Technologies and Grazing SystemsCarreira, EmanuelSerrano, JoãoLopes de Castro, JoséShahidian, ShakibPereira, Alfredohttp://hdl.handle.net/10174/361272024-01-18T10:46:37Z2023-01-01T00:00:00ZTitle: Montado Mediterranean Ecosystem (Soil–Pasture–Tree and Animals): A Review of Monitoring Technologies and Grazing Systems
Authors: Carreira, Emanuel; Serrano, João; Lopes de Castro, José; Shahidian, Shakib; Pereira, Alfredo
Editors: J Moore, Nathan
Abstract: Montado is an agro-silvo-pastoral ecosystem characteristic of the south of Portugal and
called Dehesa in Spain. Its four fundamental components—soil, pasture, trees, and animals—as well
as the climate make Montado a highly complex ecosystem. This review article provides an overview
of the state of the art of Montado from the point of view of the agro-silvo-pastoral ecosystem and
the scientific work carried out in this context. Thus, the aim is: (i) to describe and characterize the
Montado ecosystem, as an agro-silvo-pastoral system; (ii) to reveal experimental tests carried out,
technologies used or with the potential to be used in the monitoring of Montado; (iii) to address
other technologies, carried out in similar and different agro-silvo-pastoral ecosystems from south
Portugal. This review consists of three chapters: (a) components of Montado and their interactions;
(b) advanced technologies for monitoring Montado; (c) grazing systems. No review article is known
to provide an overview of Montado. Thus, it is essential to carry out research on grazing and its
effects on the soil and pasture in the Montado ecosystem.2023-01-01T00:00:00ZEconomic Feasibility of PV Mounting Structures on Industrial RoofsPerdigones, A.Garcia, J.L.Garcia, I.Baptista, F.J.Mazarrón, F.R.http://hdl.handle.net/10174/360772024-01-15T11:41:47Z2023-01-01T00:00:00ZTitle: Economic Feasibility of PV Mounting Structures on Industrial Roofs
Authors: Perdigones, A.; Garcia, J.L.; Garcia, I.; Baptista, F.J.; Mazarrón, F.R.
Abstract: This study determines the viability and profitability of photovoltaic (PV) mounting struc tures on industrial roofs. For this purpose, more than 656,000 different cases have been analyzed,combining different consumption patterns, energy prices, locations, inclinations, azimuths, capacity
installed, and excess income. The results show that the industry’s consumption pattern is a key factor, leading to significant reductions in the available assembly budget for inclined structures compared to the coplanar option when the pattern is seasonal and/or irregular. The increase in energy prices experienced in the last 2 years represents a substantial change in the viability of the structures. The budget for inclined structures increases by hundreds of euros compared to the coplanar option.
Depending on the azimuth and inclination of the roof, the maximum available budget can vary by more than a thousand euros per kWp, being highly profitable in orientations close to the east and west and on roofs partially inclined to the north. Differences between low-irradiation and high-irradiation locations can mean variations in the average budget of more than 1 k€/kWp, especially with high electricity prices.2023-01-01T00:00:00Z