13 documents found, page 1 of 2
Sustainable Intensification of the Montado Ecosystem: Evaluation of Sheep Stock...
Carreira, Emanuel; Serrano, João; Shahidian, Shakib; Infante, Paulo; Paniágua, Luís; Moral, Francisco; Paixão, Luís; Pinto Gomes, C.; Lopes de Casto, J.The objective of this study was to determine how application of dolomitic limestone and stocking methods (continuous stocking or deferred stocking) affect the soil compaction, sheep grazing location, height, and nutritional value of pastures when the pasture growth rate is at its maximum. A 4 ha field at Mitra farm—University of Évora—was divided into four plots: P1 and P2—without application of dolomitic limes...
Upgrade of a Vicon RS-EDW spreader to variable rate application: Development of...
Serrano, João; Amaral, Alexandre; Shahidian, Shakib; Escribano, C.; Moral, Francisco; Marques da Silva, J.Over the last two decades, a considerable amount of equipment has been acquired (spreaders, seeders, sprayers, among others) to respond to the challenges of Precision Agriculture (PA) concept. Most of this equipment has been purchased at high costs. However, many of them, despite still being functional and equipped with sensors, actuators, and electronic processing units, capable of adjusting to variations in s...
Índice global de produtividade e qualidade das pastagens: Avaliação de sensores...
Serrano, João; Moral, FranciscoEste estudo avaliou dois sensores próximos complementares, um medidor de prato ascendente (“Rising Plate Meter”, RPM) e um sensor ótico ativo (“Active Optical Sensor”, AOS) para obter a disponibilidade de proteína bruta (PB) da pastagem em kg ha-1. Este indicador inclui a produtividade, aferida pela altura comprimida (HRPM ), e a qualidade, aferida pelo índice de vegetação de diferença normalizada (“Normalized ...
Avaliação da estabilidade temporal de zonas homogéneas de gestão (ZHG) em pasta...
Serrano, João; Marques da Silva, José; Paniágua, Luís; Moral, FranciscoA Agricultura de Precisão (AP) procura validar ferramentas tecnológicas que permitam captar a variabilidade espacial das culturas e do solo, o que constitui a base para o estabelecimento de zonas homogéneas de gestão (ZHG). Os sensores que medem a condutividade elétrica aparente do solo (CEa) são exemplo destas ferramentas no levantamento da variabilidade espacial das caraterísticas do solo. A estabilidade temp...
Definição e validação de zonas homogéneas de gestão (ZHG) na vinha: Estudo de caso
Serrano, João; Paixão, Luís; Marques da Silva, José; Moral, FranciscoNo contexto atual, de subida dos custos dos fatores de produção, é essencial otimizar a gestão dos recursos disponíveis, o que pressupõe a incorporação de tecnologias que melhorem o conhecimento sobre as variáveis envolvidas no processo produtivo. Este estudo teve por objetivo demonstrar o interesse de definir e validar zonas homogéneas de gestão (ZHG) numa vinha. Para o efeito foram realizados dois levantament...
Temporal Stability of Management Zone Patterns: Case Study with Contact and Non...
Serrano, João; Shahidian, Shakib; Marques da Silva, José; Paniagua, L.; Rebollo, Francisco; Moral, FranciscoPrecision agriculture (PA) intends to validate technological tools that capture soil and crop spatial variability, which constitute the basis for the establishment of differentiated management zones (MZs). Soil apparent electrical conductivity (ECa) sensors are commonly used to survey soil spatial variability. It is essential for surveys to have temporal stability to ensure correct medium- and long-term decisio...
Technological Upgrade of a Vicon RS-EDW Spreader: Development of a Microcontrol...
Serrano, João; Amaral, Alexandre; Shahidian, Shakib; Marques da Silva, J.; Moral, Francisco; Escribano, C.: Over the last two decades, a considerable amount of equipment has been acquired (spread ers, seeders, sprayers, among others) to respond to the challenges of the precision agriculture (PA) concept. Most of this equipment has been purchased at a high cost. However, many of them, despite still being functional and equipped with sensors, actuators, and electronic processing units capable of adjusting to variatio...
Crude Protein as an Indicator of Pasture Availability and Quality: A Validation...
Serrano, João; Shahidian, Shakib; Moral, FranciscoThis study evaluated the possibility of using two complementary electronic sensors (rising plate meter (RPM) and active optical sensor (AOS)) to obtain a global indicator, pasture crude protein (CP) in kg ha−1. This parameter simultaneously integrates two essential dimensions: pasture dry matter availability (dry matter (DM) in kg ha−1) measured by RPM, and pasture quality (measured by AOS), and supports manage...
Technological approach to evaluate the livestock trampling effect on soil compa...
Serrano, João; Shahidian, Shakib; Marques da Silva, José; Paniagua, Luís; Moral, FranciscoThe economic and environmental sustainability of extensive livestock production systems requires the optimization of soil management, pasture production and animal grazing. All these aspects are interdependent and linked to soil compaction. This study aims: (i) to assess the spatial variation of the compaction profile; (ii) to evaluate the effect of animal trampling on soil compaction; and (iii) to demonstrate ...
Pasture quality monitoring based on proximal and remote optical sensors: case s...
Serrano, João; Marques, João; Mendes, Sara; Shahidian, Shakib; Marques da Silva, José; Moral, FranciscoPermanent dryland pastures are the basis of animal feed in extensive grazing systems. Seasonality and inter-annual climatic variability, associated with shallow, acidic and not very fertile soils result in low productivity and rapid degradation of pasture quality, which requires the supplementation of animal feed. In this study, carried out in a biodiverse pasture field in the Mediterranean region of Southern P...