THE INFLUENCE OF THE CLIMATIC INDEX OF DEGREE-DAYS ON THE VITALITY OF 3-YEAR-OLD SEEDLINGS OF SCOTS PINE FROM SEEDS GRADED BY SPECTROMETRIC FEATURES

Abstract

The natural and production conditions of the growth of scots pine during forest restoration determine the research of the degree of interrelation of exogenous temperature factors with and technological processes of seed sorting with the quality of forest reproductive material. Descriptive statistics of biometric parameters of the height and diameter of the root neck were determined for the first, second, and third growing periods of individuals of Scots pine obtained by autumn transplanting containerized (1+0) seedlings sprouted from seeds conditioned by spectrometric properties to a post-pyrogenic site. The correlation relationship of the average variant of the exogenous index of degree days GDD, as well as the average variant of vitality indices was evaluated using the Spearman method based on the SPSS Statistics application software package. The degree of influence of the exogenous degree-day index on the DQI index of Scots pine crops in the 3rd growing season after transplanting containerized seedlings (1+0) sprouted from seeds of different spectrometric fractions is characterized by a weak positive correlation (p = 0.170; p = 0.05). The technological process of separating the light fraction of Scots pine seeds for the production of containerized seedlings demonstrates the best vitality indices in transplanted crops at the end of VP-III, statistically significantly (p = 0.05) differing from other spectrometric groups within the natural production conditions of this study