Germination capacity and the health status of red clover seeds following laser treatment**
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Department of Specific Plant Breeding
Department of Physics,
Department of Agricultural Microbiology University of Agriculture, Akademicka 15, 20-934 Lublin, Poland
Int. Agrophys. 2004, 18(3): 289-293
Laboratory experiments on the germination of tetraploid red clover seeds (var. Bona) were carried out completely randomly in four replications. The number of seeds germinating normally and abnormally, as well as the number of hard seeds and seeds infected with fungal disease was also determined in the experiment. Laser treatment significantly decreased the share of hard seeds and did not influence the percentage of seeds germinating normally. Seed dressings significantly decreased seed infection with disease when compared to the control and objects with laser treatment. Clover seeds were most abundantly infected by fungi of the Alternaria type (Alternaria alternata). Strains of the Phoma and Penicillium type were eliminated by laser beam with power of 3 mW cm-2 x 1 and 3 mW cm-2 x 3, and Penicillium by a dose of 6 mW cm-2 x 1 i 6 mW cm-2 x 3. Laser treatment should not be applied in the case of massive seed infection with fungi of the Alternaria type since a significant increase was noted after laser irradiation with power of 3 mW cm-2 x 3; 3 mW cm-2 x 5 and 6 mW cm-2 x 5.
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