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Nursery Seedbed Density Is Determined by Short-Term or Long-Term Objectives

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Lowering nursery seedbed density can increase the proportion of high-quality (grade 1 and 2) seedlings relative to cull (grade 3) seedlings. Outplanting higher grade seedlings can increase survival and volume production. Lowering seedbed density from present levels may therefore increase stand value at rotation age. The relationship between four seedbed density levels (60, 90, 120, and 150 seedlings/lineal bed foot) is evaluated for slash (Pinus elliottii Engelm.) and loblolly (Pinus taeda L.) pine, and the impact of grade on growth performance is projected. An economic analysis demonstrates how to determine the present value of the expenditure justified to alter seedbed density to obtain a projected future change in out-planting performance. Potential economic gains ranging from - $4.13 to $2 7.58 per thousand seedlings were derived by altering seedbed density from a base-level density of 120 seedlings/lineal bed foot. Positive values were associated with decreases in density and negative values with density increases. Site quality of outplanted areas plays a major role in determining the amount of the justifiable expenditure. South. J. Appl. For. 11(1):9-14.
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Document Type: Journal Article

Affiliations: School of Forestry and Alabama Agricultural Experiment Station, Auburn University, Auburn, AL 36849

Publication date: 1987-02-01

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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 Southern Journal of Applied Forestry covers an area from Virginia and Kentucky south to as far west as Oklahoma and east Texas.
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