An increment core shows steady or slightly declining growth rates. Periods of suppression longer than 5 years are cause for rejection. If marginal site trees must be selected, make notes of problems. Measure total height and BH age. BH age should be determined from an increment core taken at BH on the uphill side.
Accurate age depends on hitting the pith.
Record plot number, species, total height, and BH age of site trees on the back of the cruise field form. Do not record site tree information on the cruise form itself. You may use the attached site curves to estimate SI in the field. More accurate calculations, using equations, will be performed in the lab. 0.3 inches HT 0 - 100' . .