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| Titel |
Analysis of the relationship between the volumetric soil moisture content and the NDVI from high resolution multi-spectral images for definition of vineyard management zones to improve irrigation |
| VerfasserIn |
J. A. Martínez-Casasnovas, M. C. Ramos |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250022110
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| Zusammenfassung |
| As suggested by previous research in the field of precision viticulture, intra-field yield
variability is dependent on the variation of soil properties, and in particular the soil moisture
content. Since the mapping in detail of this soil property for precision viticulture applications
is highly costly, the objective of the present research is to analyse its relationship with the
normalised difference vegetation index from high resolution satellite images to the
use it in the definition of vineyard zonal management. The final aim is to improve
irrigation in commercial vineyard blocks for better management of inputs and to
deliver a more homogeneous fruit to the winery. The study was carried out in a
vineyard block located in Raimat (NE Spain, Costers del Segre Designation of Origin).
This is a semi-arid area with continental Mediterranean climate and a total annual
precipitation between 300-400 mm. The vineyard block (4.5 ha) is planted with
Syrah vines in a 3x2 m pattern. The vines are irrigated by means of drips under
a partial root drying schedule. Initially, the irrigation sectors had a quadrangular
distribution, with a size of about 1 ha each. Yield is highly variable within the block,
presenting a coefficient of variation of 24.9%. For the measurement of the soil
moisture content a regular sampling grid of 30 x 40 m was defined. This represents a
sample density of 8 samples ha-1. At the nodes of the grid, TDR (Time Domain
Reflectometer) probe tubes were permanently installed up to the 80 cm or up to reaching a
contrasting layer. Multi-temporal measures were taken at different depths (each
20 cm) between November 2006 and December 2007. For each date, a map of
the variability of the profile soil moisture content was interpolated by means of
geostatistical analysis: from the measured values at the grid points the experimental
variograms were computed and modelled and global block kriging (10 m squared blocks)
undertaken with a grid spacing of 3 m x 3 m. On the other hand, three Quickbird-2
satellite images where acquired and processed to monitor plant vigour. The dates
of images acquisition were: 29-07-2004, 13-07-2005 and 13-07-2006. They are
within the range of |
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