Integration of optical and analogue sensors for monitoring canopy health and vigour in precision viticulture
Articolo
Data di Pubblicazione:
2010
Citazione:
Integration of optical and analogue sensors for monitoring canopy health and vigour in precision viticulture / F. Mazzetto, A. Calcante, A. Mena, A. Vercesi. - In: PRECISION AGRICULTURE. - ISSN 1385-2256. - 11:6(2010), pp. 636-649.
Abstract:
Remote-Sensing (RS) is the most widely used technique for crop monitoring in
precision viticulture systems. This paper considers the possibility of substituting RS
information obtained by various proximal sensing technologies employed directly in
vineyards in order to enable a simultaneous evaluation of canopy health and vigour status.
To this aim, a mobile lab has been developed. It consists of (a) two GreenSeeker RT100
sensors, a commercial optical device calculating NDVI, and Red/NIR indices in real time;
(b) three pairs of ultrasonic sensors to estimate canopy thickness; and (c) a DGPS receiver
to geo-reference data collected while travelling in a vineyard. During the 2007–2008
campaign, tests were carried out in a commercial vineyard in order to evaluate the monitoring
system performance regarding disease appearance, diffusion, and vegetative
development variations due to the normal growing process of vines. Surveys with the
mobile lab were conducted in two groups of rows, treated and untreated with agrochemicals,
and compared to manual morphological and physiological observations that characterised
the phytosanitary status of the canopy. Measurement repeatability was verified;
both NDVI values and ultrasonic data showed high repeatability (with r = 0.88 and
r = 0.85, respectively). Optical data were processed in order to obtain NDVI maps, which
clearly showed differences in canopy vigour evolution in the two examined groups, with
low vegetative vigour in areas infected by Plasmopara viticola, as confirmed by manual
assessment. Maps of the percentage infection index (I%I) were produced according to
pathological manual survey results. The comparison between I%I and NDVI maps qualitatively
confirmed the real vine phytosanitary status. Ultrasonically measured canopy
thickness (UCT) was calculated and compared to manually measured canopy thickness
(MCT) (r = 0.78). UCT and NDVI values were compared in order to identify areas
affected by disease among zones presenting critical vegetation conditions.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Ground sensing; NDVI; Canopy thickness; Vegetative vigour
Elenco autori:
F. Mazzetto, A. Calcante, A. Mena, A. Vercesi
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