O experimento foi conduzido em um pomar experimental em Prislonica, próximo a cidade de Cacak (Oeste da Sérbia) em solos pobres e ácidos durante os anos de 2008 e 2009 (segundo e terceiro ano após o plantio). O objetivo do trabalho foi de determinar o efeito do porta-enxerto da Myrobalan de variedades criadas em forma de Vaso aberto e do interenxerto, Espinho prêto de variedades criadas em forma de Copa central liderada no comprimento da parte aérea (PA), da área do corte transversal do tronco (ACTT), da produção (P), coeficiente de rendimento (CR), massa do fruto (MF), conteúdo solúvel das matérias (CSM), da total quantidade de acidez (TQA) e a relação entre os conteúdos das matérias solúveis e da total quantidade de acidez, ou seja, o índice do maturidade (CSM/TQA = IA). Os testes incluiram 5 árvores de damasco de cada combinação porta-enxerto/variedade e porta-enxerto/interenxerto/variedade em 4 repetições. Os valores médios dos tratamentos foram comparados pelo LSD teste para p < 0,05. Com base nos resultados deste estudo, o porta-enxerto Myrobalan com a criação da forma de Vaso aberto provocou o crescimento das árvores de damasco e maior peso dos frutos. O interenxerto Espinho prêto com criação da forma de Copa central liderada provocou a redução do crescimento da árvore, maior produção, coeficiente de rendimento e pode ser adequado para plantios de alta densidade. Além disso, este interenxerto causou maior relação entre CSM/TQA em comparação com o porta-enxerto Myrabalan. Outras características do fruto, tais como o conteúdo das matérias solúveis e da total quantidade de acidez, são semelhantes a este respeito em ambas as variantes em condições de solos pobres e ácidos.

The experiment was carried out in the experimental orchard in Prislonica near Cacak (Western Serbia) on poor and acidic soil in 2008 and 2009 (second and third year after planting) to determine the effects of Mirobalan rootstock and Blackthorn interstocks with Open vase and Central leader tree conduce system on the length of shoot (LS), trunk cross-sectional area (TCSA), yield (Y), yield efficiency (YE), fruit weight (FW), soluble solids content (SS), titratable acidity (TA) and soluble solids/titratable acidity ratio or ripening index (SS/TA = RI). In the trial there were 5 trees from each apricot rootstock-cultivar and rootstock-interstock-cultivar combination in four replications. The analysis of variance was done in a completely randomized design. The treatment means were compared using LSD test at p < 0.05. Based on the results of this work, the Myrobalan rootstock with Open vase tree conduce induced a high vigorous of apricot trees and higher fruit weight. The Blackthorn interstock with Central leader tree conduce induced a less vigorous tree, higher yield and yield efficiency, and may be better suited for high-density plantings. Also, this interstock showed the higher SS/TA ratio when compared with Myrobalan rootstock. Other fruit quality traits, such as soluble solids content and titratable acidity were similar and respectable in both variant under poor and acidic soil conditions.

A two-year field study was conducted to examine the capacity of spontaneous formation of long sylleptic shoots (LSS) in nursery trees of pear cvs. 'Abbé Fétel', 'Conference' and 'Starking Delicious' grafted on Quince MA (MA) and Quince BA 29 (BA 29) rootstocks in a nursery during the first year after bud grafting. Tree height (TH), trunk diameter (TD) - 10 cm above the bud union and number of LSS were measured at the end of each season. The TH was measured from the ground level. The highest number of LSS was developed by cv. 'Abbé Fétel' in both the seasons, and the lowest by cv. 'Starking Delicious'. Tree height and TD were highly significantly affected by the cultivar in both the years and by the rootstock in 2008. The interactions between them did not significantly affect the examined parameters. The study showed that the early growth and syllepsis of pear nursery trees during the first year after bud-grafting were incomparably more affected by the cultivar than by the rootstock under similar weather conditions and on the same soil in a crop rotation system.