Germination of Seeds and Adaptation of Beech Seedlings of Plaiul Fagului-23 Origin Under the Influence of Bioregulators

The purpose of this research was to study the effect of bioregulators on the germination of beech seeds of Plaiul Fagului-23 origin and adaptation of seedlings under solarium and natural conditions. The highest mean daily germination (0.74) was observed for 0.001 and 0.0001% (w/v, dry residue) Juniperus sabina. During stratification under laboratory conditions, the highest seed germination (82.64%) occurred in 0.0001% J. sabina. The highest seed germination rate index was observed in 0.0001 and 0.0005% J. sabina (1.17 and 1.57, respectively). The average germination time of 0.01% alginite No. 2 and 0.0005% J. sabina was below that of the control by 1.05-1.11 days. The length of the roots of germinated beech seeds with alginite No. 2 and 0.001% J. sabina significantly exceeded that of the control (39.66 mm), reaching 56.04 and 52.05 mm, respectively. Under solarium conditions, the highest rate of seedling emergence was observed in variants alginite No. 6 (92.50%), 0.0005% J. sabina (91.11%), 0.001% J. sabina (90.00%) and alginite nano powder (82.35%), which exceeded the control by 1.6–1.8 times. The height of the plants in alginite No. 2 (13.50 cm), 0.0001% J. sabina (12.24 cm) and 0.001% J. sabina (10.08 cm) significantly exceeded the control. Under natural conditions, the germination of seeds treated with alginite nano powder (60.80%) and alginite No. 6 (47.47%) was significantly higher than that of the control (42.67%) and those treated with gibberellic acid (43.73%). The height of the plants treated with alginite nano powder (28.10 cm), 0.01% genistifolioside (29.70 cm) and 0.004% gibberellic acid (28.22 cm) significantly exceeded that of the control.