An Education Blog

word direction logo

Leaf area index and light distribution in olive tree canopies (Olea europaea L.) – IJAAR

Mouna Aïachi Mezghani , Gouta Hassouna, Laaribi Ibtissem, Foued Labidi

Olive Tree Institute, Station of Sousse, Sousse, Tunisia

Institut Supérieure Agronomique Chott Mériem; Sousse, Tunisia

Key words: Olive tree, Vase form, LAI, Photosynthetically active radiation, ratio PART/PARI.


The leaf area index (LAI) and the spatial leaf arrangements are the main factors which influenced the radiant energy distribution within the tree. The leaf area index has been shown to be an important factor of the olive productivity. Although, the photosynthetically active radiation intercepted by leaves (PAR) is the main environmental factor that determined the dry matter production, which is the main source of energy for the photosynthesis. Therefore, a commercial sensor for LAI determination (Sun scan DELTA-T Devices Ltd), was tested for olive trees, in an olive orchard located near Sousse, central Tunisia (36N, 10E). The plants were cultivated at 7m × 7m and trained on vase system. Measurements were made at two tree’s layers; on lower and upper part of the canopy and on the four cardinal directions (north, south, east and west). The results showed that the LAI was more important on the lower part of the canopy than on the upper one for all directions. LAI was also higher on South and East side of tree. The Incident Photosynthetically Active Radiation PARI, was quite constant for all directions. However, the transmitted fraction PART decreased inside the tree canopy. The lower part of the canopy was less shaded for the vase tree form. There is a significant negative relationship between LAI and ratio PART/PARI. These results will be the fundamental basis of the olive pruning basis and to establish new intensive olive orchards with fully developed canopies which intercepted the maximum solar radiation.

Get the original articles in Source: Archive for | IJAAR |- May, 2016

Journal Name: International Journal of Agronomy and Agricultural Research (IJAAR)

Published By: International Network for Natural Sciences

Leave a Reply