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Effects of M.26 and P 14 rootstock trunk height on the growth, cropping, and longevity of four apple cultivars in a 10-year trial

Alojzy Czynczyk*, Barbara Guzowska-Spaleniak**

**Research Institute of Pomology and Floriculture
**Pomologiczna 18, 96-100 Skierniewice, Poland
**Experimental Station
**Miłob±dz near Tczew, Poland
**e-mail: aczynczy@insad.pl

The effect of rootstock trunk height of two semi-dwarf rootstocks M.26 and P 14 on the most important indices of 4 vigorously growing apple cultivars: ‘Melrose’, ‘Jonagold’, ‘Gloster,’ and ‘Bieling Boskoop’ was determined in a 10-year trial. The 4 heights: 5, 15, 25, and 35 cm of budded trees were investigated. Their growth vigour was negatively correlated with rootstock trunk height. The smallest trees were those worked at 35 and 25 cm. In order to obtain trees with a size comparable to those budded on M.9, the trunk of M.26 rootstock should be 15 to 20 cm high and of P 14 about 30 cm. Total yield over 10 years of the experiment was in general proportional to tree size. The highest yield was obtained from trees budded at a standard height of 5 cm. Trees budded at heights 35 and 25 cm had the highest yielding efficiency index. Rootstock trunk height had no effect on fruit quality. No frost injuries on the budding place on tree trunks were observed in the climate of northern Poland, where the experimental orchard was located.

Czynczyk A., Guzowska-Spaleniak B., 2002. Effects of M.26 and P 14 rootstock trunk height on the growth, cropping, and longevity of four apple cultivars in a 10-year trial. Folia Horticulturae 14/2: 191-199.