The cumulative curve follows the same general configuration for most functions of tree growth whether it is tree ht, dia, basal area or cubic volume. Although the exact of the cumulative growth curve will differ with variable used and climatic functions, the elongated S-shaped pattern is characteristic that can be invariably expected.

From the forgoing, it is seen that wood production in the central stem of tree can be predicted by measuring past rates of dia & ht growth. The primary objective of the most tree growth studies is the reliable predictions of future wood yield.

Although the cumulative growth curves for both area and volume growth are typically S-shaped, the exact form of the curves is variable. Basal area growth may be estimated from periodic measurement of dbh. Bole surface are growth may be estimated by calculating surface area from periodic measurements of stem diameters at predetermined intervals along the stem.

Volume growth, the most important growth determination, may be estimated by taking periodic measurements of dbh, dbhand ht, or dbh, ht and form and determining volumes at the beginning and at the end of a period from local, standard, or form-class volume table as appropriate, and then taking the difference.