اثر شدت نور و هرس ريشه بر رشد نهال بلند مازو

Influence of light intensity and root pruning on growth

This study was done to show the effect of light intensity (100%, 75% and 50% of whole sunlight) and root pruning (15, 30 and 45 cm of whole root lenght) on oak (Q. castaneif lia) seedling growth. The study was done as split-plot design and factorial experiment woth 3 replicates in Caspian Forests, north of Iran. The results of 2nd year after plantation showed the significance of sunlight on height growth. Maximum height growth happened under 50% and 75% light intensities. On the other hand, root pruning did not have any effect on height growth but had no collar diameter growth where as the minimum was occured over the roots pruned of 30 and 45 cm. There was no any interaction between light density and root pruning on height growth as well as collar diameter growth. Overall, the rootpruning more than 30 from seedling collar and light level less than whole sunlight were the best treatment for obtaining the thicker and longer oak seedlings.