Promotion of seed production in Douglas-fir grafts by girdling + gibberellin A4/7stem injection, and effect of retreatment
✍ Scribed by Stephen D. Ross; Ralph C. Bower
- Publisher
- Springer Netherlands
- Year
- 1991
- Tongue
- English
- Weight
- 643 KB
- Volume
- 5
- Category
- Article
- ISSN
- 0169-4286
No coin nor oath required. For personal study only.
✦ Synopsis
Application.
Girdfing in combination with a single stem injection of the growth regulator gibberellin m4/7 call be a highly cost-effective treatment for enhancing seed yield in Douglas-fir seed orchards. Diminished tree vigor and flowering response to biennial retreatment can result, however, unless trees are properly managed to minimize the physiological stresses associated with treatment and the heavy cone bearing which follows. Alleviation through irrigation and possibly fertilization of compounding water and nutrient stresses following treatment and during the off-treatment year to will speed the recovery and should enable trees to be safely retreated on a biennial basis.