Learn how to use the growth intercept method to estimate SI.
The growth intercept (GI) method predicts SI from height and age measurements taken on carefully selected sample trees. As of March 1999, the GI method is available for the following species:
Although the GI method is the best way to estimate SI in many stands aged 3 to 30 years breast height age (Figure 5.1), another method may have to be chosen if the appropriate species tables are not available.
When correctly used, the GI method provides an accurate estimate of SI. However, the required input data (heights and ages) are costly to collect and determining ages may damage crop trees.
The GI method cannot be used in stands where sample trees have been:
Note: It is best to use the BEC method for the type of stands listed above.