Productivity of apricot cultivars in the region of Belgrade

Abstract

The productivity of 35 apricot cultivars was studied at the "Radmilovac" experimental estate of Agricultural Faculty in Belgrade in the period of eight years (1996-2003). Cropping of apricot cultivars was irregular and variable, both over years and cultivars. During eight-year period of research a high yield was achieved in four, low in two, whereas in two years there were no yield at all because of the occurrence of late spring frosts. The average yield ranged from 2.6 kg per tree in cv Stella to 42.4 kg per tree in cv Sulmona. A specific cumulative yield varied from 72 to 960 g per cm2 of trunk cross-section area. Due to a high oscillation in cropping between years, coefficients of variations for yield had very high values (77-122%). As compared to a standard cultivar - Hungarian Best, statistically significantly high yield was obtained in eight cultivars (Sulmona, Marculesti 22/6, Szegedi Mammut, Silistrenska kompotna, Gönci magyar kajszi and Kostjuzenskij). Moreover, statistically significantly low yield was obtained in also eight cultivars (Stella, NJ A- 1, Karola, Alfred, Detskij and Selena). On the basis of average yield per tree, apricot cultivars were classified into four groups of productivity: low (1 cv), medium (11 cvs), high (18 cvs) and very high productivity (5 cvs).

Na oglednom dobru "Radmilovac" Poljoprivrednog fakulteta u Beogradu proučavana je rodnost 35 sorti kajsije u periodu od osam godina (1996- 2003). Rodnost sorti je izražena preko prinosa u kg po stablu, kao i specifičnog kumulativnog prinosa u g po cm2 površine poprečnog preseka debla. Utvrđene su značajne razlike u prinosu kako između proučavanih sorti, tako i između godina ispitivanja. Na osnovu prosečnog prinosa po stablu izvršena je klasifikacija sorti u četiri grupe: slabo rodne (1), srednje rodne (11), rodne (18) i vrlo rodne (5).