Pamphlets on Conservation of Natural Resources, Volumen6U.S. Government Printing Office, 1913 |
Dentro del libro
Resultados 1-5 de 58
Página 10
... Soil Fertility was the primary problem on which the talents , scholar- ships and practical experiences of the delegates were concentrated . Last year , in Indianapolis , we devoted our thought largely to the conservation of Human Life ...
... Soil Fertility was the primary problem on which the talents , scholar- ships and practical experiences of the delegates were concentrated . Last year , in Indianapolis , we devoted our thought largely to the conservation of Human Life ...
Página 23
... soil against erosion . From the study of conditions , however , existing in other countries , it may be inferred that , in order not to disturb the natural balance , the proportion of forest land to other kinds of land must be not less ...
... soil against erosion . From the study of conditions , however , existing in other countries , it may be inferred that , in order not to disturb the natural balance , the proportion of forest land to other kinds of land must be not less ...
Página 45
... soil , which have good annual growth , and which meet market demands are chosen , favorable returns may be expected . An investment in planting offers the least incentive to private owners since returns do not come within a short period ...
... soil , which have good annual growth , and which meet market demands are chosen , favorable returns may be expected . An investment in planting offers the least incentive to private owners since returns do not come within a short period ...
Página 47
... soil are the important factors which determine forest types , hence , in forest regions these factors must be considered in deciding the prac- ticability of forest planting and in the preparation of plans for commercial reforestation of ...
... soil are the important factors which determine forest types , hence , in forest regions these factors must be considered in deciding the prac- ticability of forest planting and in the preparation of plans for commercial reforestation of ...
Página 48
aspect or exposure , altitude , soil in respect to kind , depth and moisture , under- lying rock , etc. Other facts are essential in planning large operations , but the considerations named are fundamental in reaching decision as to ...
aspect or exposure , altitude , soil in respect to kind , depth and moisture , under- lying rock , etc. Other facts are essential in planning large operations , but the considerations named are fundamental in reaching decision as to ...
Términos y frases comunes
acres administration agricultural American Forestry Association amount annual average camp cent Chairman commercial companies conifers Conservation Congress consumer cooperation cost course Douglas fir effect eucalyptus favor Federal Government feet field fire protection fire wardens forest fires forest land forest law forest products forest protection forest schools Forest Service forest taxation Forestry Committee future grades growth hardwood important increase interest investment legislation logging lumber lumber industry lumbermen manufacturing meeting methods mill moisture mountains national forests operations Oregon organization patrol patrolmen planting possible practical precipitation present private forestry private owners problem profit property tax railroad ranger school reason reforestation region revenue sections secure silvicultural soil spark arresters species stumpage sub-committee supply timber land timber owners tion town trees utilization waste white pine woods yellow pine yield tax