PERFORMANCE OF TREE GROWTH CHARACTERISTICS IN SELECTED PROGENIES OF COLUMNAR APPLE CULTIVARS
The growth habit of columnar apple trees was assessed during 2006-2010 in 11 progenies preliminarily selected from seven different parental combinations. Progenies of the same parental combination involved either trees of different age or trees on different rootstocks (M9 and seedling rootstocks). In total 308 trees were assessed. Particular progenies were mutually significantly different both in their mean tree vigour defined by their final tree height and mean, by length of annual terminal prolongation as well as by variability of these characteristics within progenies. In some progenies the length of annual terminal prolongation was significantly influenced by their actual fruit set level. Particular progenies were furthermore significantly distinguished in mean number of side shoots and especially in their general variability. The highest numbers of ramification were generated by genotypes on seed rootstocks and also by genotypes that in a given year had no fruit set. Smaller differences among progenies were found in intensity of central axis by spurring (their number and length) and in the extent of its bare wooding. Application of seed rootstocks significantly prolonged age when trees of the studied genotypes reached their first yielding. The most vigorous trees growing on the seedling rootstocks presented significantly lower productivity. This effect of tree vigour had not been observed in any progeny on rootstock M.9.
Blazek, J. (2013). PERFORMANCE OF TREE GROWTH CHARACTERISTICS IN SELECTED PROGENIES OF COLUMNAR APPLE CULTIVARS. Acta Hortic. 976, 345-353
tree vigour, ramification, spurring