Radiometric characteristics of photoselective and photoluminescent films. Plastic films for protected cultivation capable of modifying the spectral distribution of the transmitted radiation can be developed with suitable radiometric characteristics in order to influence plant vegetative activity. In order to study such films, experimental tests were carried out at the experimental farm of the University of Bari in Valenzano (Bari, Italy), at latitude 41° 05' N, from December 2006 to September 2007. Two photoselective films (GREEN4% and GREEN2%), three photoluminescent films (RED,BLUE and RED-BLUE) and one low density polyethylene film were used as greenhouse coverings for cherry trees and peach trees. The photoselective films GREEN4% and GREEN2% alter the quality of solar radiation passing through the covering materials modifying the spectral distribution of the solar radiation in the wavelength range of the red radiation (R, 650-670 nm) and of the far red radiation (FR, 720-740 nm) in comparison with the natural solar radiation recorded in open field. The photoluminescent films RED, BLUE and RED-BLUE have the capacity to absorb UV radiation in order to re-emit it in the wavelength of red radiation,blue radiation and red-blue radiation, respectively.The results showed the radiometric characteristics of these innovative plastic films. The photoselective films GREEN4% and GREEN2% were characterised by a reduction of the R/FR ratio of the photon fluence rate in the red to that in the far red in comparison to the natural solar radiation.
Caratteristiche radiometriche di film fotoselettivi e fotoluminescenti
VOX, Giuliano;SCARASCIA MUGNOZZA, Giacomo;SCHETTINI, Evelia
2010-01-01
Abstract
Radiometric characteristics of photoselective and photoluminescent films. Plastic films for protected cultivation capable of modifying the spectral distribution of the transmitted radiation can be developed with suitable radiometric characteristics in order to influence plant vegetative activity. In order to study such films, experimental tests were carried out at the experimental farm of the University of Bari in Valenzano (Bari, Italy), at latitude 41° 05' N, from December 2006 to September 2007. Two photoselective films (GREEN4% and GREEN2%), three photoluminescent films (RED,BLUE and RED-BLUE) and one low density polyethylene film were used as greenhouse coverings for cherry trees and peach trees. The photoselective films GREEN4% and GREEN2% alter the quality of solar radiation passing through the covering materials modifying the spectral distribution of the solar radiation in the wavelength range of the red radiation (R, 650-670 nm) and of the far red radiation (FR, 720-740 nm) in comparison with the natural solar radiation recorded in open field. The photoluminescent films RED, BLUE and RED-BLUE have the capacity to absorb UV radiation in order to re-emit it in the wavelength of red radiation,blue radiation and red-blue radiation, respectively.The results showed the radiometric characteristics of these innovative plastic films. The photoselective films GREEN4% and GREEN2% were characterised by a reduction of the R/FR ratio of the photon fluence rate in the red to that in the far red in comparison to the natural solar radiation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
