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SPATIAL VARIABILITY

Nondestructive Measurement of Grapevine Leaf Area by Ground Normalized Difference Vegetation Index

^a ECAV, UMR EGFV, Institut des Sciences de la Vigne et du Vin de Bordeaux, Domaine INRA de la Grande Ferrade, BP 81, 33883 Villenave d'Ornon Cedex, France
^b Chateau Couhins, Chemin de la Gravette, BP 81, 33883 Villenave d'Ornon Cedex, France

^* Corresponding author (drissirachid{at}yahoo.fr).

Vine leaf area index has a great impact on berry quality. This study was conducted to determine whether vine leaf area index could be estimated, and mapped through normalized difference vegetation index (NDVI) ground-based measurements. The NDVI measurements were performed using a Greenseeker (N-Tech Industires, Ukiah, CA and Oklahoma State Univ., Stillwater), pointed sideways at the vertical shoot positioned vines [Vitis vinifera (L.)] at Bordeaux, France. Canopy gap fraction and vertical leaf area index (VLAI) measurements were also performed. Plot NDVI maps were obtained by linking the GreenSeeker to a GPS during measurements. The NDVI delivered by the sensor was sensitive to the variations of vertical leaf area index and gap fraction of the canopy, that is, vine vigor. The GreenSeeker was successfully used to carry out a follow-up of the foliar growth of the vine, but with many precautions. The maps obtained showed relative variations of vigor at an intraplot level, enabling access to relevant information for better vineyard management.

Abbreviations: LAI, leaf area index • NDVI, normalized difference vegetation index • PW, pruning weight • VLAI, vertical leaf area index

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Received for publication May 17, 2007.