Variability of flowering and seed crop in a clonal seed orchard of Scots pine (Pinus sylvestris L.)
2012
Daničić, Vanja (Faculty of Forestry, Banja Luka (Bosnia and Herzegovina)) | Isajev, Vasilije (Faculty of Forestry, Belgrade (Serbia)) | Mataruga, Milan (Faculty of Forestry, Banja Luka (Bosnia and Herzegovina)) | Cvjetković, Branislav (Faculty of Forestry, Banja Luka (Bosnia and Herzegovina))
The analysis of quantitative and qualitative characteristics of flowering and cones crop abundance was carried out in clone seed orchard of the Scots pine (Pinus sylvestris L. ) at the location Stanovi near Doboj on 37 year-old trees. Phenological observations were carried out on on 214 ramets in 20 clones in the springs of years 2005 and 2006. The obtained results indicate the presence of the notable variability of regularity and the abundance in creation of micro- and macrostrobiles of Scots pine in the seed orchard, where all the flowering abundance grades ranged from "+" to "5". The conducted analysis of crop abundance showed a high percentage of ramets without crops (70% - 79%). The results indicated that the function of the orchard is not compatible with its purpose, and that there are possible genetic and ecological factors that cause the absence of seed crops. The results of two-year-old analyses are important for future activities related to establishing new seed orchards.
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