Where any land, not being agricultural land, and not being subject to any right of common, is used for a plantation or a wood or for the growth of saleable underwood, the rateable value of the land shall be estimated in accordance with subsections (2) to (4) of this section.
If the land is used only for a plantation or a wood, the rateable value shall be estimated as if the land, instead of being a plantation or a wood, were let and occupied in its natural and unimproved state.
If the land is used for the growth of saleable underwood, the rateable value shall be estimated as if the land were let for that purpose.
If the land is used both for a plantation or a wood and for the growth of saleable underwood, the rateable value shall be estimated either as if the land were used only for a plantation or a wood, or as if the land were used only for the growth of the saleable underwood growing thereon, as the valuation officer may determine.