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Estimating Volume Potential in Genetic Tests Using Growth and Yield Models

Genetic field tests are subjected to many disturbances such as damage from diseases, insects, fire, wind, and ice. The differences in standing volume among plots in many older genetic field tests largely reflect differences in density due to uncontrolled disturbances rather than inherent differences in growth rate. Hence, standing volume is often subject to large experimental errors which makes it unsatisfactory for measuring genetic differences in growth rate. Height of dominant-codominant trees is much less dependent on density and therefore is a better measure of inherent growth rate differences. Growth and yield models can be used to translate differences in dominant-codominant height into volume differences expected in the absence of uncontrolled disturbances. This approach is illustrated with loblolly pine data from the Southwide Pine Seed Source Study.

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Author(s): Warren L. Nance, O. O. Wells

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 1981

Section: Section 1: Predicting Growth and Yield of Genetically Improved Stock