It is defined as the boring of a tree stem with pressler’sincrement or any other borer to determine increment of trees with annual rings

Field work

1. Selection of trees: Typical trees are selected
2. Measurement:
   • Two dbh(ob) are measured & recorded
   • Bark removed
   • Bored to 4-5 cm so that at least 15-20 rings
   • Length of outermost 5 rings measured, one end of each of the two diameter on a particular tree recorded and totaled
3. Computation
   • Width of 5 rings & average diameter class curve
   • Age –dbh curve
   • Increment for lowest dia and added the increment to lowest to get final diameter
   • Then, again resulted dia is taken as original and increment for that is determined and added to get other diameter.