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Bird's-foot trefoil (Lotus corniculatus L.) is a perennial species with lower seed germination ability because of the large share of hard seeds. To increase germinating ability, the trial was based on treating bird's-foot trefoil seeds with ultrasounds (at different intensities and for different periods of time); they were then kept for a few days at -3 0°C. Treatment results show that the control variant (not treated) reached a germination level of 57.80%, while the variant treated with ultrasounds and thermally reached a germination level of 94.53% (i.e. 63.5% more). [ABSTRACT FROM AUTHOR]

The large variety of seed size at the Bird's-foot trefoil (Lotus corniculatus L.) affects their quality by the proportion of "hard" and "moldy" seeds. Studies found that germination energy, performed at a 5 days interval, varies depending on seed size: 71.8% at the class of medium seeds, 77% at small seeds, 82.2% at ungrouped seeds and 88.7% at large seeds. The average of results shows an increase in the proportion of "hard" seeds at the version with ungrouped seeds (3.11%) and a decrease in seeds grouped by size classes (1.77-2.42%). At the small and medium-sized groups of seeds there was no record of "moldy" seeds. [ABSTRACT FROM AUTHOR]