Korean cedar (Pinus koraiensis Sieb. et Zucc.) seed production during its introduction in voronezh region forest-steppe

The paper presents the research materials of Korean cedar introduction in the forest-steppe conditions of Voronezh region. Full compliance of its vital processes with the conditions of introduction is determined. The influence of the factor of tree placement in the territory — free or as part of other conifers on seed production — has been established. The increase of trees yield was revealed when artificial pollination was applied to them in comparison with non-pollinated trees. Attention was drawn to the moment of formation of multi-top tree crowns by formation of «empty» cone at the top of the central conductor. The high perspectivity of the breed cultivation in these conditions with obtaining both silvicultural and economic effect is pointed out. The forecast of yield of Korean pine crops under certain conditions of technology is given. Taking them into account in the creation of Korean pine seed object from 1 hectare of cultivated area it is possible to obtain the yield from the moment of grafting age in 25 years in the amount of 123 kg of nuts.