PSHS main page    Folia Horticulturae

Full text    Current issue content   Search      

Comparison of the optical properties of the fruit tree stems: the sweet cherry, cherry, pear, common plum and walnut trees

Jan Pilarski*,**, Krzysztof Tokarz*

**Institute of Plant Physiology
**Polish Academy of Sciences
**Niezapominajek 21, 30-239 Kraków, Poland
**Institute of Biology
**Świętokrzyska Academy
**Świętokrzyska 15, 25-406 Kielce, Poland
**e-mail: pilarski@ifr-pan.krakow.pl

The studies conducted in the 400-700 nm range of wavelength showed that, in the studied fruit trees, the reflectance of irradiation from stems was similar and equaled 9-15% of the falling irradiation. Together with the age of stems the absorbance increased, but the transmittance of irradiation through the cork to the chlorophyll layer of the bark decreased. Spectral research showed that with increasing wavelength, there was a decrease in absorbance but an increase in irradiation transmittance through the cork. In the PAR range, the transmittance of current-year stems in pear trees equaled 26%, in the cherry and walnut 20%, and in the sweet cherry and common plum 14%. In 3-year-old stems in pear trees, transmittance equaled about 15%, in the cherry 10%, common plum and walnut, and in the sweet cherry 6 %. In the 400-500 nm range, transmittance through the cork equaled 5% in pear trees, 2% in the walnut and 1% in the cherry, common plum and sweet cherry. In older stems, irradiation transmittance decreased and in 3-year-old stems in pear trees equaled 1.6 %, and in the other species was below 1%. In the 600-700 nm range in current-year stems, transmittance equaled 51% in the pear, about 40% in the cherry and walnut, 30% in the common plum, and in 3-year-old stems equaled about 15% in pear trees, decreased to 10% in the cherry, common plum and walnut, and was in the sweet cherry the lowest and equaled only 6%.

Pilarski J., Tokarz K., 2005. Comparison of the optical properties of the fruit tree stems: the sweet cherry, cherry, pear, common plum and walnut trees. Folia Horticulturae 17/2: 89-101.