Evaluation of apple cultivars and hybrids in a fruit nursery
The study was conducted in the fruit nursery of the Institute of Agriculture - Kyustendil during a two-year period (2011-2012). The main aim of this study was to check the quality of nursery trees of 24 introduced apple cultivars and hybrids, grafted on MM 106 rootstock. The rootstocks were budded at the height of 15 cm from the ground by chip budding on July 28. During the research, the following indicators were measured: percentage of developed buds, growth dynamics of the nursery trees, the number of plants with sylleptic shoots, the height and the thickness of nursery trees and at the end of the growing season. Percentage of standard and non-standard trees was recorded according to the norms of the Bulgarian State Standard. It was established that the Hybrid Nº 6 and Rubin had the highest percentage of developed buds, while Red General and Pinova had the lowest values. Remo, Free Redstar, Melfree, Gold Millennium, Reandra, Primera, Hybrid Nº 6 and Red General had a stronger growth and Brina, Pacific Rose, Longlu, Honglu, the hybrid Pinova × Fuji, Goldrush, Yanga 1 and Renora had weaker growth, compared to the standard (Granny Smith) and the rest of cultivars. Cultivars Granny Smith, Longlu, Yanga and the Pacific Rose showed a tendency to form sylleptic shoots in the nursery. The highest percentage of standard planting material was obtained from Hybrid Nº 6, Granny Smith and Rubin and the lowest from Brina, Pacific Rose and the hybrid Pinova × Fuji.
Sotirov, D., Dimitrova, S. and Song, L. (2016). Evaluation of apple cultivars and hybrids in a fruit nursery. Acta Hortic. 1139, 491-496
Malus × domestica, planting material, 'MM 106' rootstock, growth