The prolonged influence of growth stimulants on morphometric indicators of three-year seedlings of main forest forming species of Central Siberia

Abstract

The prolonged effects of growth stimulants with differences in active substance on morphometric parameters of three-year old seedlings of Scotch pine Pinus silvestris L., Siberian spruce Picea obovata Ledeb., Siberian larch Larix sibirica Ledeb., whose seeds had been treated with growth substances were studied. Analyzing a set of indicators: seed germination, seedling safety, height and diameter of trunks at root collar of 3-year-old seedlings in the forest-steppe zone of the Krasnoyarsk territory the reaction specificity of coniferous seedlings to seeds pre-plant processing are stated. It was found that height, height increment and stem diameter of Scots pine seedlings whose seeds were treated with stimulants Obereg’, Zircon, Epin-extra, Ecogel were significantly higher than seedlings under control. Seedling height and height increment of Siberian spruce seeds, which were processed by the stimulant Epin-extra were significantly more than the same under control. In addition to Epin-extra, Zircon and Heteroauxin stimulants had a positive effect on Siberian spruce seedling stem diameter. Siberian larch seeds treatment by all stimulants except Immunotsitofit, had a positive impact on the height and diameter of stem 3-year-old seedlings. The highest stem diameter was observed in seedlings whose seeds were treated with Ecogel and Heteroauxin stimulants. All stimulants had a significant positive effect (1.5–2 times higher compared to control) on the current linear increments.

Keywords

• growth stimulants
• seedlings
• morphometric indicators
• coniferous