Now showing items 230-241 of 241

    • Valoración social de las propiedades estéticas de los hayedos en Cataluña 

      Vega García, Cristina; Burriel López, Marta; Alcázar Montero, Jorge (Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (Espanya), 2011)
      Se aplican métodos ensayados en otros países (Scenic Beauty Estimation Method, SBE) para la determinación de las cualidades estéticas de masas forestales de interés recreativo a parcelas en diversas localizaciones del haya ...
    • Variable rate application of plant protection products in vineyard using ultrasonic sensors 

      Gil Moya, Emilio; Escolà i Agustí, Alexandre; Rosell Polo, Joan Ramon; Planas de Martí, Santiago; Val, Luis (Elsevier, 2007)
      The changes in the shape and size of vines during the growing season require a continuous adjustment of the applied dose to optimize spray application efficiency. Target detection with ultrasonic sensors can be used to ...
    • Variable rate dosing in precision viticulture: Use of electronic devices to improve application efficiency 

      Llorens Calveras, Jordi; Gil Moya, Emilio; Llop, Jordi; Escolà i Agustí, Alexandre (Elsevier, 2010-03)
      Two different spray application methods were compared in three vine varieties at different crop stages. A conventional spray application with a constant volume rate per unit ground area (1 ha(-1)) was compared with a ...
    • Variable rate sprayer. Part 1 – Orchard prototype: design, implementation and validation 

      Escolà i Agustí, Alexandre; Rosell Polo, Joan Ramon; Planas de Martí, Santiago; Gil Moya, Emilio; Pomar Gomà, Jesús; Camp, Ferran; Llorens Calveras, Jordi; Solanelles Batlle, Francesc (Elsevier, 2013)
      Discussions in recent decades about dosage models for applying plant protection products in orchards have failed to reach a compromise solution. Furthermore, canopies are spatially variable, and a uniform dose may not be ...
    • Variable rate sprayer. Part 2 – Vineyard prototype: design, implementation, and validation 

      Gil Moya, Emilio; Llorens Calveras, Jordi; Llop, Jordi; Fàbregas, X.; Escolà i Agustí, Alexandre; Rosell Polo, Joan Ramon (Elsevier, 2013)
      The structural characteristics of the canopy are a key consideration for improving the efficiency of the spray application process for tree crops. However, obtaining accurate data in an easy, practical, and efficient way ...
    • Water distribution uniformity and scheduling in micro-irrigation systems for water saving and environmental protection 

      Barragán Fernández, Javier; Cots Rubió, Lluís; Monserrat Viscarri, Joaquín; López Alonso, Raúl; Wu, I.P. (Elsevier, 2010)
      Micro-irrigation can apply water with high uniformity. However, uniformity alone is not sufficient to achieve the goal of irrigation. Irrigation scheduling is equally important in micro-irrigation systems. The significance ...
    • Weed discrimination using ultrasonic sensors 

      Andújar, Dionisio; Escolà i Agustí, Alexandre; Dorado, José; Fernández-Quintanilla, César (John Wiley & Sons, 2011)
      A new approach is described for automatic discrimination between grasses and broad-leaved weeds, based on their heights. An ultrasonic sensor was mounted on the front of a tractor, pointing vertically down in the inter-row ...
    • What do sensors tell us about crops? 

      Martínez Casasnovas, José Antonio; Arnó Satorra, Jaume; Escolà i Agustí, Alexandre (New Ag International SARL, 2017-10-17)
      Crop sensors provide farmers with rapid, objective, quantitative and precise (repeatable) measurements difficult or impossible to obtain by other means. Those data, usually acquired during the 1st stage of the PA cycle ...
    • What sensors tell about the crop environment 

      Arnó Satorra, Jaume; Martínez Casasnovas, José Antonio; Escolà i Agustí, Alexandre (New Ag International SARL, 2017-09-14)
      Our great-grandparents and their ancestors did not use any sensor but knew their fields perfectly. The reason is that they had their feet on the ground, literally. They had to walk throughout their fields either sowing, ...
    • Wildfire spread, hazard and exposure metric raster grids for central Catalonia 

      Alcasena, Fermín; Ager, Alan A.; Salis, Michele; Day, Michelle A.; Vega García, Cristina (Elsevier, 2018-01-04)
      We provide 40 m resolution wildfire spread, hazard and exposure metric raster grids for the 0.13 million ha fire-prone Bages County in central Catalonia (northeastern Spain) corresponding to node influence grid (NIG), crown ...
    • Wind and snow damage in the Pyrenees pine forests: effect of stand attributes and location 

      Martín Alcón, Santiago; González-Olabarria, José Ramón; Coll Mir, Lluís (Finnish Society of Forest Science, 2010)
      Wind and snow-induced damage have been analyzed at stand level for three pine forests in the Central-Eastern Pyrenees (Pinus nigra Arn. salzmanii, Pinus sylvestris L. and Pinus uncinataRam.). Stand-level models have been ...
    • Yield and water use efficiency of barley in a semiarid Mediterranean agroecosystem: long-term effects of tillage and N fertilization 

      Morell Soler, Francisco Joaquín; Lampurlanés Castel, Jorge; Álvaro-Fuentes, Jorge; Cantero-Martínez, Carlos (Elsevier, 2011)
      Conservation tillage systems (no-tillage, NT; and minimum tillage, MT) are being adopted in rainfed agroecosystems of the Mediterranean basin where water availability is the main limiting factor for crop productivity. ...