Feasibility of using pyranometers for continuous estimation of ground cover fraction in table grape vineyards

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2014Author
Martinez-Cob, Antonio
Faci González, José M.
Medina, Eva T.
Suvocarev, Kosana
Suggested citation
Martinez-Cob, Antonio;
Faci González, José M.;
Blanco Alibés, Olga;
Medina, Eva T.;
Suvocarev, Kosana;
.
(2014)
.
Feasibility of using pyranometers for continuous estimation of ground cover fraction in table grape vineyards.
Spanish Journal of Agricultural Research, 2014, vol. 12, núm. 3, p. 603-610.
https://doi.org/10.5424/sjar/2014123-5453.
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Show full item recordAbstract
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 (GCF ref ) at a table grape vineyard
grown under a net. Daily pyranometer-driven GCF estimates (GCF pyr ) were obtained from solar radiation measurements
above and below the canopy. For GCF pyr 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). GCF pyr and GCF ref (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 GCF pyr in this crop despite the short number of pyranometers used.
Further research is required to develop more appropriate calibration equations of GCF pyr and for a more detailed
evaluation of using a short number of pyranometers to estimate GCF.
Is part of
Spanish Journal of Agricultural Research, 2014, vol. 12, núm. 3, p. 603-610European research projects
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