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Petrovaradin, Serbia

Kovacevic B.,University of Novi Sad | Miladinovic D.,Serbian Institute of Field and Vegetable Crops | Orlovic S.,University of Novi Sad | Tomovic Z.,Public Enterprise Vojvodinasume | And 2 more authors.
Propagation of Ornamental Plants | Year: 2012

The influence of CoCl2 on cutting rooting of five eastern cottonwood genotypes was examined. Rooted cuttings were treated with 100 μM CoCl2 four weeks after the planting and morphological rooting characteristics were measured eight weeks after the experiment establishment. According to LSD-test treatment with cobalt chloride had positive effect on almost all examined characters, but only in number of roots on the basal 5 cm of cutting, number of roots from the 5th to 10th cm of cutting, number of roots on basal 10 cm of cutting, and total number of roots that effect was statistically significant. The obtained results indicate that for some difficult-to-root genotypes the treatment with cobalt could have a positive effect on rooting.

Pantic D.,University of Belgrade | Medarevic M.,University of Belgrade | Dees M.,Albert Ludwigs University of Freiburg | Borota D.,University of Belgrade | And 5 more authors.
Archives of Biological Sciences | Year: 2015

The growth characteristics of silver fir are of high importance for selection forest management, and for the current aims laid out in Serbia's forest management focused on increasing the share of silver firs in Serbia's growing stock. With the objective of increasing the understanding of the growth characteristics of silver fir, the growth of two silver fir trees felled during forest site production research on Mt. Goc, located in Central Serbia, have been analyzed. Both trees showed significant differences in their growth dynamics over long periods as results of micro-site and micro-stand effects (primarily ambient light regime). The common growth characteristic of the two trees, a 450-year-old tree as the main study object (labeled Tree A) and a 270-year-old Tree B is a long stagnation stage. For Tree A the latent phase, with small interruptions, lasted 410 years; one phase lasted 330 years in continuity, which is the longest period of silver fir stagnation recorded in Europe. Tree B showed a long-lasting stagnation stage that lasted 170 years. The long stagnation stage of Tree A, characterized by an average diameter increment of 1.4 mm/year (average growth ring width of 0.7 mm) and an average height increment of 0.08 m/year, shows the extraordinary silver fir capacity for physiological survival in complete shade. This study adds to the existing knowledge of the shade tolerance of the silver fir. Therefore, the silver fir belongs to the group of extremely shade-tolerant tree species. This characteristic makes silver fir an irreplaceable tree species in the selection forest structure. It offers a wide range of silvicultural flexibility in the management of these forests, and is applicable to silver fir selection Serbia's forests.

Cortan D.,University of Belgrade | Tubic B.,Public Enterprise Vojvodinasume | Sijacic-Nikolic M.,University of Belgrade | Borota D.,University of Belgrade
Sumarski List | Year: 2015

Morphological study of intra and interpopulation variability of black poplar leaves was carried on four natural populations located in the basin of the major rivers at the area of Vojvodina, Serbia. Research was conducted on the basis of nine leaf morphometric parameters, with descriptive and multivariate statistical analysis. Results show that within and between studied populations exists considerable variability, with the variability much more pronounced within than between populations. Given that the environmental conditions of investigated locations are uniform, it is assumed that the variability is consequences of the specific gene pool of these populations.

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