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provide results quickly. At the present time, the root growth capacity (RGC) test is used extensively, but results require 2-4 wk and do not always predict field survival accurately. The objective of this study was to evaluate 3 recently suggested alternative indicators of seedling vigor: the starch content of roots (Puttonen, 1986), the osmotic concentration of xylem sap and biochemical markers of seedling vigor (Duryea, 1985).

Evaluation of some markers of vigor in seedlings of Douglas fir (Pseudotsuga menziesii (Mirb.) Franco)