Factors affecting graft success and early growth of Fraser fir

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Title: Factors affecting graft success and early growth of Fraser fir
Author: Frey, Haley Hibbert
Advisors: Dr. John Frampton, Committee Chair
Abstract: Two studies were conducted to investigate factors influencing graft success and subsequent growth of Fraser fir [Abies fraseri (Pursh) Poir]. The traditional time of grafting (late winter/early spring) was compared with eight summer/early fall grafting dates from mid-July through mid-October. Optimal grafting success (95%) was in the late winter/early spring (April) while the scions were dormant and the rootstocks were becoming active. Success of subsequent grafting dates decreased from 52% (14 July) to 0% (20 Oct.). Shade improved summer graft success (52% with, 38% without). Irrigation did not affect graft success or growth. Grafting of stored dormant scion material in summer/early fall was not successful (< 1%). In a second study, success and subsequent growth of Fraser fir cleft grafts were studied in relation to season of grafting (late summer vs. spring), grafter, and origin of scion material (height in the tree and lateral branch order (first vs. second). Grafting in early September yielded only 3% success compared to 70% for mid-April. Grafters had significantly different graft success (86% for Grafter 1 with 5 years experience vs. 54% for Grafter 2 with 1 year experience). First-order laterals from the upper crown yielded the best graft success and growth (except plagiotropism). First-order laterals were better than second-order laterals for all growth measurements.
Date: 2009-04-27
Degree: MS
Discipline: Forestry
URI: http://www.lib.ncsu.edu/resolver/1840.16/1113

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