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Título : Feasibility of using pyranometers for continuous estimation of ground cover fraction in table grape vineyards
Autor : Martínez-Cob, Antonio ; Faci González, José María ; Blanco Alibés, Olga; Medina Pueyo, Eva Teresa ; Suvočarev, Kosana
Palabras clave : shading
PAR
Vitis vinifera
global solar radiation
Fecha de publicación : jul-2014
Editor: Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (España)
Citación : Martínez-Cob A, Faci JM, Blanco O, Medina ET, Suvocarev K. Feasibility of using pyranometers for continuous estimation of ground cover fraction in table grape vineyards. Spanish Journal of Agricultural Research 12 (3): 603-610 (2014)
Resumen: This paper evaluates the feasibility of using pyranometers for continuous estimation of ground cover fraction (GCF) at remote, unattended sites. Photographical techniques were used for measuring GCF (GCFref) at a table grape vineyard grown under a net. Daily pyranometer-driven GCF estimates (GCFpyr) were obtained from solar radiation measurements above and below the canopy. For GCFpyr computation, solar radiation was averaged for two hours around solar noon (midday periods) and for daylight periods (8:00 to 18:00 Universal Time Coordinated). GCFpyr and GCFref (daylight periods) showed a good agreement: mean estimation error, 0.000; root mean square error, 0.113; index of agreement, 0.967. The high GCF attained, the large measurement range for GCF and the presence of the net above the table grape were the likely reasons for the good performance of GCFpyr in this crop despite the short number of pyranometers used. Further research is required to develop more appropriate calibration equations of GCFpyr and for a more detailed evaluation of using a short number of pyranometers to estimate GCF.
Descripción : 8 Pags.- 4 Figs.- 2 Tabls.
Versión del editor: http://dx.doi.org/10.5424/sjar/2014123-5453
URI : http://hdl.handle.net/10261/100959
DOI: 10.5424/sjar/2014123-5453
ISSN: 2171-9292
E-ISSN: 1695-971X
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