Effect of cutting thickness on rooting, shoot emergence and growth of Populus ciliata Wall. Ex. Royle provenances

摘要

Effect of cutting thickness on the rooting and shoot growth of selected clones of Populus ciliata was examined in a nursery trial during 1999 and 2000. Sprouting, rooting, seasonal growth and survival increased with the increasing thickness of cuttings. The cuttings of 20-25mm thickness produced significantly higher number of secondary and tertiary roots. The cuttings of 15-20 mm thickness recorded maximum shoot growth. However, shoot emergence and time taken for sprouting decreased with the increase in size of cutting. The clone Nagni with 15-20 mm thickness showed maximum shoot height (236cm). While the clone Narkanda with 10-15 mm thickness recorded the maximum rate of emergence (3.78) and the same clone with 20-25 mm diameter produced maximum secondary and tertiary roots.