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Height and diameter growth and volume production of 22 different clones of poplars were evaluated in Sliepkovce populetum at the age of 12 years. The populetum is situated on medium-heavy and medium humic uninundated alluvia of the Laborec river; typologically, the group of forest types is Ulmeto-Fraxinetum populeum. The results of evaluation documented that among the poplars under study the clones Gigant, OP-229 and BL achieved the best growth and maximum volume production while their mean height amounted to 22.9–23.8 m, mean diameter to 31.9–33.2 cm and average annual volume increment was 25.1–28.3 m3 per 1 ha. The growth of P. Rochester 20/66 poplar was considerably much slower: its mean height amounted to 17.3 m, mean diameter to 18.7 cm and average annual volume increment was 6.3 m3 per 1 ha. It will be necessary to carry out further studies to obtain more detailed values for these clones.

Preliminary results of research on main growth characteristics of different poplar clones in ecological conditions of Východoslovenská Lowland