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dc.contributor.authorLlorens Calveras, Jordi
dc.contributor.authorGil Moya, Emilio
dc.contributor.authorLlop, Jordi
dc.contributor.authorEscolà i Agustí, Alexandre
dc.description.abstractTwo 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 application method designed to compensate electronically for measured variations in canopy dimensions. An air-blast sprayer with individual multi-nozzle spouts was fitted with three Ultrasonic sensors and three electro valves on one side, in order to modify the emitted flow rate of the nozzles according to the variability of canopy dimensions in real time. The Purpose of this prototype was to precisely apply the required amount of spray liquid and avoid over dosing. On average, a 58% saving in application volume was achieved with the variable rate method, obtaining similar or even better leaf deposits.
dc.description.sponsorshipThis work was funded by the Spanish Ministry of Education and Science, and was part of research project AGL2007-66093-C04-02/AGR. We are grateful to Professor Jordi Valero from Universitat Politècnica de Catalunya for his help in the statistical analysis and Xavier Vidal director of the School of Viticulture “Mercè Rosell” at Espiells (Barcelona) for his help during the field experiments.
dc.relationMIECI/PN2004-2007/AGL2007‐66093‐ C04‐02/AGR
dc.relation.isformatofVersió postprint del document publicat a:
dc.relation.ispartofCrop Protection, 2010, vol. 29, num. 3, p. 239-248
dc.rightscc-by-nc-nd, (c) Elsevier, 2009
dc.subjectUltrasonic sensor
dc.subjectCanopy volume
dc.subjectVariable rate application
dc.subjectPrecision viticulture
dc.subjectCrop-adapted spraying
dc.subjectVine row volume (VRV)
dc.titleVariable rate dosing in precision viticulture: Use of electronic devices to improve application efficiency

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cc-by-nc-nd, (c) Elsevier, 2009
Except where otherwise noted, this item's license is described as cc-by-nc-nd, (c) Elsevier, 2009