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Home Publications National Nursery Proceedings 1990 Root Growth Potential and the Target Seedling

Root Growth Potential and the Target Seedling

The review focuses on several key points regarding the conduct and interpretation of Root Growth Potential tests I n forest regeneration. Key points are 1) RGP is developed in the nursery and is expressed after planting; 2) RGP can be accurately assessed in as little as seven days in several species; 3) RGP is a very good indicator of seedling quail- ty but only a fair predictor of survival; 4) survival predic- tion is only fair because RGP indicates plant quality, not site quality or planting quality; 5) RGP can indicate when seedlings possess high stress resistance or when seedlings are damaged; 6) RGP seasonal periodicity seems to be modulated internally by (a) the intensity of shoot dorman- cy and (b) the strength of the carbon sink in the growing shoot; and 7) despite problems associated with lack of accuracy and precision and often unrealistic expectations, RGP testing remains a valuable tool for assessing quality of planting stock.

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Author(s): Gary A. Ritchie, Yasuomi Tanaka

Publication: National Nursery Proceedings - 1990

Event: Combined Meeting of the Western Forest Nursery Associations
1990 - Roseburg, OR