IMPROVED TECHNOLOGIES FOR GROWING SEEDLINGS OF FOREST-FORMING SPECIES IN THE VOLGOGRAD REGION

Abstract

Background. Issues on improvement of technologies of cultivation of planting material are associated with the need to intensify this process to provide an accessible and adapted assortment of woody species. Modern strategies for implementation of natural climatic solutions on degraded lands of Volgograd region provide for attraction of forest-forming adaptive tree species: Quercus (39,8%), Pinus (15,8%), Populus (7,5%).
 Purpose. Improve the technology of production of Quercus robur planting material.
 Materials and methods. On the basis of the Nizhnevolzhsk tree breeding station - a branch of the Federal Research Center of Agroecology RAS (Kamyshin, Volgograd Region), outdoor and indoor plots were allocated to improve production technology. Certified seed material Quercus robur L. (certificate of quality №34/25675, 34/25727) was used in the experiments. To ensure optimal conditions for development, the scheme of irrigation and nutrient regime (ammonium nitrate, Solar universal) were developed. Experimental data on the growth of seedlings were processed by methods of mathematical processing. The standard of seedlings is determined in accordance with the Order of the Ministry of Natural Resources of Russia from 04.12.2020 № 1014.
 Results. The effectiveness of growing seedlings Quercus robur L. with closed and open root systems is shown. The characteristics of the substrate are given, the regime of mineral nutrition, as well as the regime of watering to maintain the optimum temperature and humidity of the air and substrate are developed. Analysis of the dynamics of biometric data of plants with closed root system showed that 92% reached the standard within 2 months, with open root system - 56% of seedlings at the end of the growing season.
 Conclusion. According to the indicators of quality, time and volume of production, the advantage of the technology of growing Q. robur L. with closed root system.