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Augering and Fertilization Stimulate Growth of Blue Oak Seedlings Planted from Acorns but not from Containers

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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: 1995-10-01

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  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Western Journal of Applied Forestry covers the western United States, including Alaska, and western Canada; WJAF will also consider manuscripts reporting research in northern Mexico that has potential application in the southwestern United States.
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