GERMINATION OF SEEDS OF SPECIES OF THE GENUS HYDRANGEA L. DEPENDING ON GENOTYPE AND SOWING METHOD
Abstract
Purpose. To determine the soil germination of seeds from plants of the genus Hydrangea L. depending on their biological characteristics and sowing methods. Methods. Laboratory, measuring and weighing, mathematical and statistical.
Results. It was determined that the soil germination of seeds of plants of the genus Hydrangea L. depended to a significant extent on the sowing method. On average across species, the highest germination rates were obtained with surface sowing covered with sand and with surface sowing followed by light pressing of the seeds into the soil – 80.7–81.6 % and 82.2–82.7 %, respectively, with full emergence occurring after 28 days. When seeds were sown without covering, soil germination was significantly lower, and full emergence occurred after 32 days. The lowest soil germination rate was obtained when seeds were sown into the soil at a depth of 0.5–0.8 cm–69%. Full emergence was achieved after 43 days. Significantly higher soil germination rates for both hydrangea species – Hydrangea macrophylla and Hydrangea arborescens – were obtained when seeds were sown on the soil surface with sand covering and on the surface, lightly pressing the seeds into the soil. Soil germination of both hydrangea species was significantly lower when seeds were sown into the soil at a depth of 0.5–0.8 cm. For all sowing methods, a trend toward higher soil germination of Hydrangea arborescens seeds compared to Hydrangea macrophylla was observed, which was confirmed in all years of the study. Analysis of variance revealed that the factor “sowing method” had the greatest influence on soil germination, accounting for 87.5 %.
Conclusions. Significantly higher soil germination rates were obtained when seeds were sown on the soil surface and covered with sand (81.0 %) and when seeds were sown on the soil surface and lightly pressed into the soil (82.1 %), compared to sowing seeds 0.5–0.8 cm deep, which yielded a soil germination rate of 69 %. No significant differences were found depending on genotype.
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