ISHS Acta Horticulturae 732: VIII International Symposium on Canopy, Rootstocks and Environmental Physiology in Orchard Systems
ECOPHYSIOLOGICAL CHARACTERIZATION OF THE CANOPY OF PEACH (P. PERSICA L. BATSCH) IN TWO PLANTING SYSTEMS |
| Authors: | A. Motisi, F.P. Marra, F. Pernice, T. Caruso |
| Keywords: | leaf boundary layer conductance, omega factor, net radiation, Penman-Monteith equation, transpiration, tree shape |
| Abstract:
The aim of this research was to evaluate the effect of planting system on within-tree variation in net radiation (Rn), photosynthetic photon flux density (PPFD), leaf boundary layer conductance (gbl) and leaf-atmosphere decoupling factor (Ω); variables that are involved in the computation of potential transpiration using the Penman-Monteith equation. Orchard and within-canopy measurements were done on two different planting systems based on two training systems: delayed vase (dV) at 500 trees/ha and free-standing Y (fsY) at 1000 trees/ha. Within-canopy ecophysiological variables measured were: light intensity (PPFD), total radiation (Rt), leaf boundary layer (gbl) and stomatal conductance (gs). Radiation measurements (Rt) were done by miniaturized photo-diodes specifically built and calibrated. The two training systems had different patterns of within-canopy PPFD, Rn and gbl. In particular, in fsY trees, light intensity and total radiation were higher in the upper part of the canopy; while in the medium and lower layers of the canopy, PPFD and Rt patterns were not affected. Pattern of within-canopy variation of gbl was affected by training system, with steeper changes from the inner to the outer part of the canopy in dV. The canopy of the fsY, which was more coupled to the atmosphere, was estimated (from the Penman-Monteith equation) to have higher transpiration potential than the thicker and denser dV canopy. | |
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