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Nowadays, the territory of pedunculate oak (Quercus robur L.) in Serbia is  less widespread than in the past, primarily as the consequence of excessive  exploitation and aggravated regeneration caused by the changed groundwater  regime. The researches in this paper were aimed at the analysis of the  variability of the content of macroelements in leaves, as well as of the soil  characteristics in the pedunculate oak populations on the different sites,  according to which the sites with the best conditions for the nutrition of  pedunculate oak would be singled out. The analyzed populations are of natural  or artificial origin, and they occurred during the process of restitution.  They are situated in the zone ranging from continental to moderate  continental climate, at five different localities and five different types of  soil. Foliar analyses of 150 individual - trees of pedunculate oak at five  sites in Serbia and the respective soil analysis show that individual  variability in macroelements among trees was not statistically significant,  while the site effect was highly significant. Concentrations of elements, at  all sites, in the decrease sequence were: N>Ca>K>Mg>P>Na. The highest  individual variability was exhibited by Na, followed by Mg, Ca and K, and P  as well as N had the lowest variability. The obtained results point to the  conclusion that the variability of the content of macroelements in leaves is  mainly the result of the environmental influence. Statistically significant  intra-individual variability, as an indicator of the existence of genetic  differences between trees within populations, was detected only for Ca  concentration in leaves

Variability of nutritive macroelements in pedunculate oak (Quercus robur L.) leaves in Serbia