Nursery and site preparation interaction research in the United States |
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Authors: | South David B Rose Robin W McNabb Ken L |
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Institution: | (1) School of Forestry and Wildlife Sciences and Alabama Agricultural Experiment Station, Auburn University, Auburn, AL 36849-5418, USA;(2) Department of Forest Science, Oregon State University, Corvallis, OR |
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Abstract: | Researchers in the United States have generally taken a ``segregated' approach to regeneration research. As a result, trials involving nurserytreatments are usually separated from trials involving site preparationtreatments. Researchers have concentrated on just the main treatmenteffects. Little effort has been placed on examining potential interactionsbetween nursery and site preparation treatments. Only a few nursery bysite preparation (NxSP) studies have been established. The profession hasgenerally assumed that gains from nursery and site preparation treatmentsare simply additive, or that the relative gains from nursery treatmentswould be insignificant when compared to intensive site preparationtreatments. Both of these assumptions may be incorrect.This review examines some of the NxSP interaction trials that have beenestablished in the United States during the last half of the 20thcentury. We predict that as rotation ages for plantations decrease, the needfor NxSP interaction trials will increase. NxSP interaction studies will berequired if researchers wish to include both nursery and site preparationtreatments in their early establishment models. To date, only a fewestablishment models have been developed in the United States. |
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Keywords: | growth and yield interactions regeneration research designs seedling quality silviculture |
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