Abstract
The effects of branch pruning device Stihl HT-75 were researched on sample plots in FA Kupinovo and FA Klenak, in poplar plantations of Populus?euramericana 'I-214', Populus?euramericana 'M1' and Populus deltoides of different planting spaces and different ages. The analysed factors were: pruning method, site conditions, number of pruned branches, pruning height, branch diameter, etc. Time measurement was performed by the flow method, and the required number of measurements was calculated by variation statistics. The results of the analysis of variance show the statistical significance of the differences between pruning times of different clone species, different planting spaces and different plantation ages. The results of the analysis of variance and statistical tests show that there are no statistically significant differences between the average time of poplar pruning in plantations of the same age and different planting spaces. The correlation of branch pruning time and the number of pruned branches is represented by the power function model, which according to the results of the regression analyses, is the best representation of the nature of this dependence. Exponential function represents the correlation of the average diameter of pruned branches and the time of pruning. Also, there is a correlation of the average diameter of pruned branches and fuel consumption. Pruning time of poplar trees increases with the increase of the average diameter of pruned branches.
Highlights
The effects of branch pruning device Stihl HT-75 were researched on sample plots in FA Kupinovo and FA Klenak, in poplar plantations of Popu lus×euramericana ’I-214’, Populus×euramericana ’M1’ and Populus deltoides of different planting spaces and different ages
The results of the analysis of variance show the statistical significance of the differences between pruning times of different clone species, different planting spaces and different plantation ages
This tending operation should be performed in due time, and pruning intensity should be harmonised with the growth characteristics and tree development
Summary
Истраживања су извршена на у засадима Populus×euramericana cl. I-214, Po pulus×euramericana cl. Ова подела извршена је првенствено због тога што је манипулација уређајем изнад ове висине знатно тежа, односно замарање радника је веће, потребно је дуже време за избор гране која се уклања и позиционирање мача је дуготрајније. Замарање радника је знатно веће приликом орезивања стабла на висини изнад 4 m, а поред тога безбедност радника је мања. И поред тога што уређај није велике тежине овакав посао изискује знатно веће замарање, а сходно томе и дуже време за одмор. Предмет анализе били су следећи елементи: врста клона, број одрезаних грана, пречник одрезаних грана, висина на којој је извршено орезивање стабла, ста рост засада и размак садње. ‒ установљење зависности времена орезивања стабла од просечног пречни ка одрезаних грана на стаблу;. ‒ установљење модела зависности времена орезивања стабла од броја одре заних грана на стаблу и др
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