Analysis of growth and development of Korean cedar trees in Voronezh region

Comparative analysis of growth and development features of grafted and ungrafted Korean cedar trees gives an idea of species specificity, determining the possibilities and methods of its introduction. As a result of studying the development of trees, when comparing the results obtained with the data of heights in the natural habitat at the age of 30 years (3.4 m), we observe that Korean cedar in the habitat conditions is 46.6 % lower than the height of grafted trees and 57 % lower than the height of non-grafted trees at the sites. It should be noted that the average height growth of the scion, as a resultant trait, is characterized by a high degree of linear correlation with the following traits: scion and scion diameters (0.84 and 0.83, respectively), crown diameter (0.87), age and height of the scion (0.81 and 0.93, respectively). We observe a generally higher level of variability for crown diameter (CV = 28.6 %) and average variability across grafting age groups, which decreases as grafting age increases (11.5 to 20.6 %). The diameter of the scion and scion at the grafting site varied greatly, both among themselves and across age groups with an average 39.3 % excess of scion over scion. Among non-grafted trees, trunk diameter at breast height correlated with crown diameter at 0.64. When Korean cedar trees are placed in groups among other species, the species tends to increase in height to the detriment of diameter, which should be taken into account when creating crops. Creation of forest growing objects with the participation of Korean cedar is better timed to rich growing conditions with the placement of trees in the row planting 3.0 × 1.0 m or creating wings of it with the placement of 2.0 × 1.5 m in alternation with rows of other species in 3 m.