G. Me, N. Valentini, M. Caviglione, C. Lovisolo
A method for measuring sunlight intensity at different points within the canopy of a hazelnut tree was used to determine its light environment and to compare two different training systems (free vase and double hedge). Canopy light infiltration was measured over a period of three years, using a portable solar bar. The bar was horizontally inserted at heights of 1, 2 and 3 m above the soil surface and oriented towards the four cardinal points. Measurements were taken for three replicate plants for each training system in the central hours of the day in mid-June. The area and stomata densities of leaves sampled from the lower and the upper parts of the canopy were recorded at the same time and also compared. To evaluate the influence of light penetration on yield, the number of female inflorescences was counted on four branches oriented towards the four cardinal points in late February. Fruit set on the same branches was determined in mid-June and at the beginning of August. In both training systems, light interception was greater on the external part than on the internal part of the canopy. The free vase system enabled better light interception in the exterior part of the canopy, especially at greater heights from the soil surface. In the case of double hedge, the higher vegetative growth and the short distance between the two plants caused reciprocal canopy shade, especially in the case of internal leaves. Female inflorescence density did not reveal any significant differences between the two training systems, but fruit set was significantly higher in the case of vase.
Me, G., Valentini, N., Caviglione, M. and Lovisolo, C. (2005). EFFECT OF SHADE ON FLOWERING AND YIELD FOR TWO DIFFERENT HAZELNUT TRAINING SYSTEMS . Acta Hortic. 686, 187-192
DOI: 10.17660/ActaHortic.2005.686.25
free vase, double hedge, canopy light infiltration, female inflorescences, nut set, stomata density

Acta Horticulturae