Abstract
The article examines the study of the influence of growth stimulants on the formation and formation of the root system of decorative conifers. Namely, western thuja (Thuja occidentalis), and its forms: western thuja f. heather-like (Thuja occidentalis var. `ericoides`), western thuja f. globose (Thuja occidentalis var. `globosa'), western thuja f. golden globe (Thuja occidentalis var.`Golden Globe`). The highest percentage of rooting in thuja western f. heather-like, regardless of the method of processing the cuttings before planting for rooting. The lowest percentage of rooting is characterized by western thuja f. globose The use of root formation stimulators in general had a positive effect on the overall percentage of rooting of both thuja western and thuja western f. globose. Treatment of cuttings with Kornevin compared to the use of Heteroauxin provided lower indicators. As a result of the research, it was established that according to the indicators of rooting of cuttings, the length of the root system, the number of shoots formed, and the number of roots, thuja western f. heather-like surpasses other forms. The lowest percentage of rooting was noted in thuja western f. spherical according to all variants of the experiment. Also, studies have shown that the differences are reliable in the length of the root system, the diameter of the root neck, growth, the number of side shoots, and the number of roots that have formed. The use of rooting stimulants on cuttings of western thuja and its forms had a positive effect on rhizogenesis and, in general, the process of root system formation. Cuttings treated with rooting stimulants have a high survival rate and outperform the control in terms of root system length, the number of shoots formed, and the number of roots, and at the same time have reliable differences in biometric indicators. It should be noted that the level of rooting in the control testifies to the appropriate technological level of work and a significant variation in the ability to root in different types of western thuja.
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