Abstract:
As short a time as fiv.e years ago it was still con-
• sidered that rotations of.35-40 years were required for
. growing softwood plantations. The reasons for this ass-
:umption are vague but it has been stated for many years
that the aim is to produce final crops with a mean diameter
overbark of 45 cm (18 inches) and it was expected
that growing periods of this length of time were necessary