ASSESSMENT OF NEW APPLE HYBRIDS
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Abstract
As a result of breeding activity at the Institute of Agriculture in Kyustendil are received a large number of apple hybrids. In the article are presented data for 5 promising hybrids. The study was carried out during the period 2012-2016. The trees are grafted on rootstock MM 106 and planted in the spring of 2007 at distances of 4.5 x 2.5 m. Ten years after planting the largest trunk crosssectional area (TCSA) had the trees of hybrid № 2/30 (‘Prima’ x ‘Sekai Ichi’) and the smallest of hybrid № 2/28 (‘Prima’ x ‘Florina’). The highest average yield per tree was obtained from hybrid № 1/3 (‘Mollie’s Delicious’ – open pollinated) - 25.8 kg, followed by № 1/5 (‘Malus robusta’ x ‘Liberty’) -24.9 kg. The fruit of № 1/5 were the largest - 230 g. The fruit of hybrid № 1/26 (‘Melrose’ x ‘Kent’) had the highest fruit flesh firmness - 9.05 kg/cm2, while those of hybrid № 2/28 and № 2/30 had the lowest firmness - 7.28 and 7.36 kg/cm2, respectively. The highest percentage of soluble solids (17,8%) and total sugar (8,7%) were contained in the fruit of hybrid № 1/3.
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