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Notes: Effect of Selected Natural and Synthetic Growth Regulators on the Growth of Ponderosa Pine Seedlings

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Abstract:

Experiments with selected naturally occurring and synthetic plant growth regulators applied as a root soak to dormant southwestern ponderosa pine seedlings revealed that only gibberellins (GA3; and GA4/7) significantly increased height growth. The effects of gibberellins on root growth was variable. The regulator o-coumaric acid, significantly increased root ovendry weight. Application of hormones and regulators as a top dip was ineffective. Forest Sci. 28:156-160.

Keywords: Pinus ponderosa; dormancy; gibberellins; plant hormones; root growth

Document Type: Miscellaneous

Affiliations: Principal Silviculturist, Rocky Mountain Forest and Range Experiment Station

Publication date: March 1, 1982

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