INFLUENCE OF PRE-SOWING HE-NE AND SEMICONDUCTOR LASER STIMULATION ON SAINFOIN SEEDS GERMINATION FOUR AND EIGHT MONTHS POST-HARVEST
Dragoslav Djokić1, Milesa Srećković2, Zoran Fidanovski3, Jelena Ilić4, Rade Stanisavljević5, Dragan Terzić1, Jordan Marković1 and Saša Barać6
1Institute for Forage Crops, 37251 Globoder-Kruševac, Serbia
2School of Electrical Engineering, University of Belgrade, Bulevar kralja Aleksandra 73, 11120 Belgrade, Serbia
3The School of Computing, Union University, Knez Mihailova 6, 11000 Belgrade, Serbia
4Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, 11120 Belgrade 35, Serbia
5Institute for Plant Protection and Environment, Teodora Drajzera 9, 11040 Belgrade, Serbia
6Faculty of Agriculture, University of Priština, Kopaonička bb, 38219 Lešak, Serbia
*Corresponding author’s e-mail: email@example.com
Sainfoin seeds were irradiated by four different lasers (He-Ne laser, three semiconductor lasers of wavelengths 670 nm, 890 nm and of wavelength range 630-680 nm). Each group of seed was irradiated only once, using different exposure times: 1-, 2-, 3- and 4- minutes. The same procedure was applied before autumn (four months post-harvest) and spring sowing (eight months post-harvest). Laser bio-stimulation showed that the optimal operation of the laser was at 890 nm using 3-minutes exposure time in both sowing periods. Slightly weaker, but also significant (p ≥0.01) impact on improving germination was in case of laser of 890 nm using 2- and 4- minutes of exposure time, and 630-680 nm laser using 4- minutes exposure time in both sowing periods. In the spring sowing, only laser of 632.8 nm using 3- minutes exposure time and laser of 670 nm laser between 2- and 4- minutes exposure time had significant improvement of seed germination. In the autumn sowing, He-Ne lasers (632.8 nm) using 4- minutes exposure time, semiconductor lasers of 670 nm laser using 3- minutes exposure time, and 630-680 nm laser using 3- minutes exposure time, also significantly (p ≥0.01) increased seed germination compared to control.
Key words: post-harvest period, sainfoin, seeds, laser stimulation, germination.