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Universidad de Chile (2011)

Estimación del índice de área foliar por medio de la interceptación de radiación solar en vid y olivo

Zamorano Orden, Nicolás Salomón

Titre : Estimación del índice de área foliar por medio de la interceptación de radiación solar en vid y olivo

Auteur : Zamorano Orden, Nicolás Salomón

Université de soutenance : Universidad de Chile

Grade : Ingeniero Agrónomo 2011

Résumé
In order to evaluate the method of Jackson and Palmer based on the interception of solar radiation for the nondestructive estimation of leaf area index (LAI) in grapevine cv. Chardonnay and olive tree cv. Arbequina, a study was conducted during the 2009-2010 season, in Cerrillos de Tamaya, Region of Coquimbo, Chile. Different plants were chosen and leaf density measurements were made for interception of solar radiation at different times of day using a linear ceptometer SS1 (Delta T Devices) to obtain LAI estimated using the methodology of Jackson and Palmer. Subsequently, foliar cover was extracted from plants and took his total weight. The total weight was transformed into leaf area meter LI-3000 (Li Cor) in grapevine and a method of image analysis with Photoshop CS4 Ultra in olive. The LAI obtained by this destructive method and LAI estimated based on light interception were related by linear regressions. The estimated LAI were dependent on measurement conditions, especially solar angle formed with the planting row. In grapevine, the best adjustment between measured and estimated values was obtained with the average LAI estimated between morning and afternoon. In olive tree, the adjustment was less adequate and needed to incorporate a correction coefficient that is specific for the conditions observed in this study. Additionally, we evaluated several methods of the indirect estimation of leaf area (leaf number, shoot length and shoot cross-sectional area (ASTB)) in grapevine, and branch cross-sectional area (ASTR) in olive. It was observed that these estimation methods can be influenced by management practices, the nature of the structure used and the complexity of obtaining the estimator. In grapevine, the number of leaves and the shoot length were successful for estimating leaf area, however, the ASTB did not show the same results, given its high dependence on management practices. In olive trees, ASTR performed well, which might be attributed to the lower incidence of management practices (pruning) in evergreen species.

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