Developmental features of Siberian spruce (Picea obovata) root system with different cultivation technologies

An assessment of the Siberian spruce (Picea obovata) root system development with different cultivation technologies on the territory of the «Michurintsev Garden» in the Novosibirsk region was carried out. The variability of the seedlings biometric indicators was established depending on the method of growing planting material: with a bare root system without transplanting and with subsequent planting in containers to obtain large-sized plants. Analysis of the data showed that five-year old transplants grown with a root-balled system for five years underdeveloped lateral roots and the decrease in the number of suction hairs were noted, which leads to a deterioration in the nutrients absorption from the substrate and the slowdown in the life processes of the plant as a whole. With transplanting in the fifth year, the dying off of the main root and the active development of lateral roots are observed, which provides an increase in the area of soil development and an improvement in the transplants nutrition. The extent of the influence of hydrothermal conditions on the growth and development of Siberian spruce (Picea obovata) transplants was studied. It has been established that the formation of the root system and the nature of the onset of phenorhythms significantly depend on the growing conditions.