Influence of stimulants on the growth and development of biennial seedlings of Korean pine (Pinus koraiensis Siebold et Zucc.)

Abstract

The object of research is represented by biennial seedlings of Korean pine (Pinus koraiensis Siebold et Zucc.), grown in a forest nursery in the GTS (Mountain Taiga Station) – a branch of the Federal Scientific Center for Biodiversity of the Far Eastern Branch of the Russian Academy of Sciences of Primorsky Krai. The influence of stimulants Zircon, Krezacin, Epin-Extra on the biometric parameters of seedlings was studied. Stimulants are used in the form of root dressing in different concentrations of solutions. The height of the trunks and the length of the roots, the diameter of the root collar, as well as the dry mass are estimated. It was revealed that the use of top dressing in the form of the noted stimulants at a solution concentration of 0.01% provides a better increase in the aerial part of Korean pine. It is also noted that the development of roots is activated. It was found that during the study period, the height was at the level of 8.1 to 12.9 cm, the diameter of the root neck was from 3 to 3.5 mm, the length of the roots was from 10.8 to 14.2 cm, the dry weight was from 1.1 to 1.62 g. An increase in indicators was found (in comparison with the samples of the control group), respectively, by 28.6-104.8; 30.1-71.1; 11.1-29.6 and 57.1-131.4%. According to the current Rules for Reforestation (Order of the Ministry of Natural Resources of Russia dated December 04, 2020 No. 1014 “On Approval of the Rules for Reforestation, the Composition of the Reforestation Project, the Procedure for Developing a Reforestation Project and Making Changes to It”; hereinafter referred to as the Reforestation Rules), Korean pine seedlings in the Far East reach standard sizes in 2-3 years. In our experiments, seedlings treated with the growth stimulator Zircon, fed with a solution concentration of 0.01%, reached the age of planting material quality after 2 years.