Abstract
The use of growth stimulants for the cultivation of oak seedlings in the Bukovyna Sub-Carpathian region allows to accelerate their development and increase their sustainability in an environment where there is no natural forest regeneration. The aim of the study was to evaluate the effect of growth stimulants at different multiplicity of treatments during the growing season on the biometric parameters of Quercus robur L. Seedlings were grown in Ecotherm containers in the glasshouse of the base nursery. The composition of the substrate for filling the containers is a mix of peat, sand and black soil in equal proportions with mycorrhiza from under the forest canopy of oak stands. The results of the effect of growth stimulants on the biometric parameters of one-year-old seedlings of common oak with a closed root system are presented. Plant growth stimulants were used for spraying and irrigation seedlings during their cultivation. The results of the research indicate a positive effect of the use of growth stimulants on the seedlings of common oak. All experimental variants showed a positive effect on the biometric parameters of one-year-old oak seedlings at three, six and nine times of feeding with growth stimulants during the growing season. The difference in the variants with the use of plant growth stimulants compared to the control in height is up to 27%, in the length of the root system – up to 43%, and in the total length – up to 29%, accordingly, depending on the dose of the stimulants and the frequency of treatment during the growing season. Refined data on the biometric parameters of one-year-old seedlings of common oak with a closed root system grown in closed ground conditions were obtained. The data obtained are useful for forest restoration in regions with damaged or degraded ecosystems where natural regeneration is limited