Augering and Fertilization Stimulate Growth of Blue Oak Seedlings Planted from Acorns but not from Containers
Abstract:Blue oak (Quercus douglasii), a widely distributed species in California, is reported to be regenerating poorly in portions of the state. To ensure this species can sustain itself, successful artificial regeneration strategies are needed. Two separate studies evaluated the effects of augering and fertilization on the field performance of direct seeded acorns and P+0 container seedlings. In each study, 30 planting spots were established for each of the 8 combinations of fertilization (none and a 21 g slow release tablet) and augering (0, 30, 60, and 90 cm). Field response was evaluated for 4 yr. Fertilization significantly increased the growth of direct seeded acorns, but not of transplanted seedlings. Augering had a similar, but less pronounced positive effect--but again, only for the acorns. For all treatments, acorns tended to grow better than transplants. These results suggest that blue oak can be successfully established by planting acorns, and that both augering and fertilization can enhance field performance. West. J. Appl. For. 10(4):133-137.
Document Type: Journal Article
Affiliations: Department of Environmental Science, Policy and Management, University of California at Berkeley, UC Sierra Foothill Research and Extension Center, 8279 Scott Forbes Road, Browns Valley, CA 95918
Publication date: October 1, 1995
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