Southern Journal of Applied Forestry · 2000 · 52 citations · 5 references
AgriculturePlant SciencesField PhenotypingForest BiometricsNursery ManagementNursery Stock GradingSeedling EmergenceSeedling EstablishmentSeedling ProductionSeedling SurvivalTree MeasurementField RegenerationLateral RootsQuality Grading Of SeedlingsSeedling GradingSeedling Growth PerformanceSeedling PhenotypingVisual Field GradingVisual Grading Scales
Abstract Past research has used detailed measurements of various growth characteristics to determine seedling grades and quality of northern red oak nursery stock. This study evaluates the effectiveness of a visual grading process, similar to those found in commercial nursery operations, to distinguish high quality seedlings. Northern red oak (Quercus rubra L.) seedlings were grown for 1 yr at two state nurseries and visually separated into three grades (cull, good, or premium) according to root and shoot characteristics. Approximately 64% of the seedlings grown at each nursery were judged to be of unacceptable size for successful field regeneration. Number of first-order lateral roots (FOLR), height, and root collar diameter (RCD) were measured for seedlings in the good and premium grades. Premium grade seedlings were significantly larger than the good grade seedlings for both nurseries. Phenotypic correlations of growth traits were strongest between number of FOLR and RCD. The results demonstrate that high quality nursery stock can be visually selected into two distinguishable grades. South. J. Appl. For. 24(2):93-97.
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