GROWTH OF HALF-SIBS OFFSPRING OF SCOTS PINE IN TEST CULTURES OF NORTHERN KAZAKHSTAN

Abstract

The article discusses the main taxation indicators of half-sibs at the age of 36 years. The total viability of all families is 51.5%, the average height is 17.04 ± 0.13 m, and average trunk diameter at a height of 1.3 m is 19.97 ± 0.21 cm. A high negative correlation (r = -0.68) was found with respect to the trunk diameter and viability indicators. It was found that the height growth of half-sibs is influenced by genotype by 30.6%, and the diameter growth - by 15.6%. A significant increase in height compared to the control was observed in 40.7% of families, while a minor increase in trunk diameter was noted in a small portion of families - 5.6%. The selective height improvement effect amounted to 8.8%, and for trunk diameter, it was 13.5%. It was determined that the offspring of plus trees obtained in the same year with free pollination in a natural plantation and a collection plot (clone of a plus tree) had both low and high overall combining ability, depending on the pollinator. Based on the results obtained, it is concluded that it is impractical to separate families from the same plus tree depending on the origin when assessing their growth.