@article{Plotnikova _2020, title={Preliminary results of progenies testing of the best and normal trees of Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) in the Forest-Steppe in Ukraine}, url={http://forestry-forestmelioration.org.ua/index.php/journal/article/view/259}, DOI={10.33220/1026-3365.136.2020.67}, abstractNote={<p class="western" align="justify"><span lang="en-US"><strong>Introduction</strong></span></p> <p class="western" align="justify"><span lang="en-US">The introduction of </span><span style="color: #222222;"><span lang="en-US">Douglas fir (</span></span><span style="color: #222222;"><span lang="en-US"><em>Pseudotsuga Menziesii</em></span></span><span style="color: #222222;"><span lang="en-US"> (Mirb.) Franco)</span></span> <span lang="en-US">into the forests in </span><span style="color: #222222;"><span lang="en-US">Forest-Steppe</span></span> <span lang="en-US">is constrained by the poorly developed forest seed base. Therefore, it is advisable to select plus trees, establish objects of a permanent forest seed base on their basis and test </span><span style="color: #222222;"><span lang="en-US">progenіes </span></span><span lang="en-US">of the best</span> <span style="color: #222222;"><span lang="en-US">Douglas fir</span></span><span lang="en-US"> trees. For this purpose, a complex assessment of the </span><span style="color: #222222;"><span lang="en-US">progenіes</span></span><span lang="en-US"> of the best</span> <span lang="en-US">and normal </span><span style="color: #222222;"><span lang="en-US">Douglas fir</span></span><span lang="en-US"> trees was carried out to determine promising ones for harvesting seeds and cuttings and to further use them when creating seed orchards in Ukrainian Forest-Steppe.</span></p> <p class="western" align="justify"><span lang="en-US"><strong>M</strong></span><span lang="en-US"><strong>aterials and Methods</strong></span></p> <p class="western" align="justify"><span lang="en-US">The study determined heights and root system lengths of 2-year-old seedlings of </span><span style="color: #222222;"><span lang="en-US">Douglas-fir in the greenhouse of Guty Forest Enterprise</span></span><span lang="en-US">, grown from seeds harvested from the best and normal trees in the experimental plantation of Kharkiv Forest Research Station in Kharkiv Region. The </span><span style="color: #222222;"><span lang="en-US">seedling seed orchard</span></span><span lang="en-US"> of </span><span style="color: #222222;"><span lang="en-US">Douglas fir</span></span><span lang="en-US"> was created in Vinnitsa Forest Research Station in Vinnytsia Region, and it has 17 progenies. The progenies were observed at the age of 3, 6 and 8. A complex assessment was carried out on a scale using equivalent indicators: growth intensity, condition, </span><span style="color: #222222;"><span lang="en-US">stem straightness</span></span><span lang="en-US">.</span></p> <p class="western" align="justify"><span lang="en-US"><strong>Results</strong></span></p> <p class="western" align="justify"><span lang="en-US">The average height of the aboveground part of 2-year-old seedlings ranged from 20.6 (progeny 2-11) to 33.5 cm (progeny 1-6), the average length of the root system – from 16.1 (progeny 2-11) to 25.0 cm (progeny 5-19) and were characterized by a low level of variability between variants.</span></p> <p class="western" align="justify"><span lang="en-US">The studies of the </span><span style="color: #222222;"><span lang="en-US">progenіes</span></span><span lang="en-US"> of the </span><span lang="en-US">best </span><span lang="en-US">and normal </span><span style="color: #222222;"><span lang="en-US">Douglas-fir</span></span><span lang="en-US"> trees on seedling seed orchard in the Right-Bank Forest-Steppe of Ukraine revealed differentiation of growth dynamics in height over 8 years. Plants of </span><span style="color: #222222;"><span lang="en-US">progeny</span></span><span lang="en-US"> 1-6 had the most average heights during the entire observation period, </span><span style="color: #222222;"><span lang="en-US">progenіes</span></span><span lang="en-US"> 5-19 and 11-18 – from 6-year-old. At the age of 8, families 1-5, 1-6, and 5-19 were characterized by the highest values of the root collar diameter, family 2-11 – by the lowest ones.</span></p> <p class="western" align="justify"><span lang="en-US">Preservation of </span><span style="color: #222222;"><span lang="en-US">Douglas fir</span></span> <span style="color: #222222;"><span lang="en-US">progenіes</span></span><span lang="en-US"> on the plantations in 2019 averaged 61.5%. The condition of the trees was good. The part of trees with </span><span style="color: #222222;"><span lang="en-US">straight</span></span> <span style="color: #222222;"><span lang="en-US">stems </span></span><span lang="en-US">was 42.9% or more.</span></p> <p class="western" align="justify"><span lang="en-US">A </span><span style="color: #222222;"><span lang="en-US">complex </span></span><span lang="en-US">assessment of the growth, condition and </span><span style="color: #222222;"><span lang="en-US">stems straightness</span></span><span lang="en-US"> of the </span><span style="color: #222222;"><span lang="en-US">progenіes</span></span><span lang="en-US"> of the best and normal </span><span style="color: #222222;"><span lang="en-US">Douglas fir </span></span><span lang="en-US">trees showed that five trees (1-5, 1-6, 3-16, 5-19, 11-18) growing in the experimental plantations of Kharkiv </span><span lang="en-US">Forest Research Station</span><span lang="en-US">, can be </span><span style="color: #222222;"><span lang="en-US">previously recommended </span></span><span lang="en-US">for the harvesting seeds and cuttings for the establishment of seed orchards in the Forest-Steppe conditions of Ukraine. The other 10 trees require a further investigation based on the research of their </span><span style="color: #222222;"><span lang="en-US">progenіes</span></span><span lang="en-US">. It is recommended to use the seeds of all evaluated </span><span lang="en-US">best </span><span lang="en-US">and normal trees (seed mixture) to establish permanent forest seed stands.</span></p> <p class="western" align="justify"><span lang="en-US"><strong>Conclusions</strong></span></p> <p class="western" align="justify"><a name="_GoBack"></a> <span lang="en-US">Taking into account biological peculiarities of </span><span style="color: #222222;"><span lang="en-US">Douglas fir</span></span><span lang="en-US"> which is characterized by moderate growth up to 10 years, studies in older age will allow us to more precisely interpret the obtained test results of the best and normal </span><span style="color: #222222;"><span lang="en-US">Douglas fir</span></span><span lang="en-US"> tree progenies and determine the beginning of the period of intensive tree growth in </span><span lang="en-US">Forest-Steppe</span><span lang="en-US">.</span></p> <p class="western" align="justify"><span lang="en-US">According to the preliminary results of the complex assessment, it is planned to include the best </span><span style="color: #222222;"><span lang="en-US">Douglas fir</span></span><span lang="en-US"> trees – candidates for plus trees, selected in the experimental plantation of Kharkiv Forest Research Station, in the State Register of plus trees.</span></p> <p class="western" align="justify"><span lang="en-US"><strong>6 Figs., 4 Tables, 26 Refs.</strong></span></p> <p class="western" align="justify"><span lang="en-US"><strong>Key words</strong></span><span style="color: #000000;"><span lang="en-US"><strong>:</strong></span></span><span lang="en-US"><em> Pseudotsuga Menziesii</em></span><span style="color: #222222;"><span lang="en-US">, progeny, seedling seed orchard, stem straightness, complex assessment.</span></span></p>}, number={136}, journal={Forestry and Forest Melioration}, author={Plotnikova , O. M.}, year={2020}, month={Jun.}, pages={67–77} }