INFLUENCE OF INTERSTOCK APRICOT CULTIVARS ON THE GROWTH AND CROP YIELD OF THE VELKOPAVLOVICKA APRICOT

Z. VACHUN
The use of selected varieties for intergrafting provided either reduction of or support the growth and crop yield of apricots (Nyiujtò, 1968; 1969; Paunovic et al., 1977, Vachun, 1980).

The goal of our investigation was to evaluate the growth and crop yield of individual combination of the Velkopavlovická apricot with interstock Prunus armeniaca L. cultivars.

In spring 1975 Velkopavlovická cultivar (clone 19/2) was planted. Stem (average height 90–100 cm) formed: Velkopavlovická cultivar (clone 19/2) - control, Tîrziu de Bucuresti, Rúzová raná, Julskij, Dzankojskij ranij and Oranzevokrasnyj.

It was found, after six years of growth, that all the interstock cultivars, when compared with the control, reduced the height of the grafted Velkopavlovická cultivar. The girth of the stem is most reduced at the cultivars Oranzevokrasnyj (by 22,43 percent) and Rúzová raná (by 15.20 percent). The similar influence had the interstock cultivars also on the crown diameter. Still more striking was the reduction of the growth with crown bulk, e.g. the interstock Oranzevokrasnyj cultivar reduced the crown bulk by 30.54 percent.

The greatest number of trees mortified with the combination, where the interstock cultivar formed Tîrziu de Bucuresti (5 percent per year). With the combination, where the interstock cultivar formed Velkopavlovická (clone 19/2), during six years of growth on a permanent site mortified not a single tree.

Individual interstock cultivars had significant influence on crop yield from one tree. Sum total of the first harvest was with the best combination (interstock cultivars were Dzankojskij ranij and Julskij) higher by 15.61–17.10 percent. Combination sharply reducing the growth had however the total harvest by 36.86–69.42 percent lower.

VACHUN, Z. (1983). INFLUENCE OF INTERSTOCK APRICOT CULTIVARS ON THE GROWTH AND CROP YIELD OF THE VELKOPAVLOVICKA APRICOT. Acta Hortic. 121, 289-294
DOI: 10.17660/ActaHortic.1983.121.39
https://doi.org/10.17660/ActaHortic.1983.121.39

Acta Horticulturae