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The research carried out refers to a study of 460 individual birdsfoot trefoil (Lotus corniculatus L.) plants in order to show relations between the cultivated seeds size and the weight of the root system, on one hand, and between the radicular system and the nodosity formation capacity of the root system (number and weight), on the other hand. The results obtained have revealed the existence of direct positive relations between these properties of the birdsfoot trefoil plants. The magnitude of these attributes values is determined by the size of the seeds used for sowing. [ABSTRACT FROM AUTHOR]

Festuca rubra L. is a good competitive species that makes up the floristic structure of temporary meadows and that are used for grazing or mixed use (haymaking field - grassland) together with Festuca pratensis L., Phleum pratense L., Poa pratense L., Trifolium repens L. and Lotus corniculatus L. The paper aims at pointing out the evolution of the floristic composition of the vegetal cover in different mixtures based on (creeping) red fescue (Festuca rubra L.), Dutch / white clover (Trifolium repens L.) and bird's-foot trefoil (Lotus corniculatus L.). Analysis of mean results concerning the structure of the floristic composition of mixtures based on Festuca rubra L. (60%) shows that in all 9 types of mixtures there was balance between the degree of participation of (creeping) red fescue and the share of the other two legume species studied. In the control variants, in the two simple mixtures, the share of Dutch / white clover was 48% and that of bird's-foot trefoil was 44%. These values decreased, on the average, with 10% when applying a rate of N50 and with 14% when applying a rate of N100. In the complex mixture, there was a mean value of the degree of participation of the two species of legumes of 46% (with a higher share of the bird's-foot trefoil) in the control variant, of 34% in the variant treated with N50 and of 30% in the variant treated with N100. [ABSTRACT FROM AUTHOR]

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]

Growth and development of common bird's-foot-trefoil (Lotus corniculatus L.) plants are influenced by seed size and weight upon sowing. Studies show that the five seed size groups influence plant vigour, i.e. a 2-4 times increase of morphological organs (roots, seedlings, leaves) in larger and heavier seed group than in smaller and lighter seed group. This increase was also pointed out by the strong correlations between seed size and plant vigour. [ABSTRACT FROM AUTHOR]

Research has focused on 4 size groups of bird's-foot trefoil (Lotus corniculatus L.) (Ø 1.0-1.6 mm) and 10 variants of ultrasound treatments with different intensities and exposure times (0.11-2.72 W/cm2 and 10-160 seconds). After treating the bird's-foot trefoil seed groups with ultrasounds, the bird's-foot trefoil seeds were put into Petri vases for germination and the following parameters were measured: germinating energy (after 10 days), germinating faculty (after 21 days) and share of hard bird's-foot trefoil seeds (after 31 days). Research results show a very significant decrease of the share of hard bird's-foot trefoil seeds in the groups of medium- and large-size bird's-foot trefoil seeds treated with ultrasounds, compared to the control variant (no group seeds) or to the small-size bird's-foot trefoil seed group treated with ultrasounds. Intensity and exposure time do not correlate with the share of hard bird's-foot trefoil seeds. [ABSTRACT FROM AUTHOR]

In this paper the authors point out the impact of ultrasounds on seed germination in bird's-foot trefoil (Lotus corniculatus L.). The bird's-foot trefoil seeds, grouped into 4 size groups, were exposed to ultrasounds with variable intensities and exposure times ranging between 0.11 and 2.72 W/cm2 and between 10 and 160 seconds. Research shows that both germinating energy and germinating ability measured at 10 and 21 days, respectively, were positively impacted by ultrasounds. The highest values were when we treated with ultrasounds medium- and largesize bird's-foot trefoil seeds. [ABSTRACT FROM AUTHOR]