| |
| | Unasylva - Vol. 1, No. 1 - The Growth of the World's Forests |
 | | The smallness of the stands of timber per hectare in the north is due chiefly to the small diameters of the trees which the sites, conditioned by soil and climate, are capable of producing. |
 | | Even today, true yields per hectare are probably higher than is generally indicated by statistics which are often based on mere estimates or on methods of computation which are themselves in the course of development. |
 | | The task of the silviculturist, therefore, consists in seeing to it that the extracted material is duly replaced, that annual growth occurs in the required quantity on a reduced number of stems, and lastly, that both these objectives are attained at the same time. |
| www.fao.org /docrep/x5339e/x5339e06.htm (6062 words) |
|