 Historical evidence enforces this danger. In the Orient there are large tracts almost absolutely bare of soil, on which stand ruins implying former flourishing populations. Other longtilled lands bear similar testimony. It must be noted that more than...  Popular Science Monthly - Página 101908Vista completa - Acerca de este libro
 | 1909 - 508 páginas
...flourishing populations. Other longtilled lands bear similar testimony. It must be noted that more than loss of fertility is here menaced. It is the loss...channels, is an impressive warning of the danger of negligent practices. Nor is this all; the wash from one acre is often made the waste-cover for another... | |
 | California. Department of Public Instruction - 1909 - 106 páginas
...depth, surface wastage should not exceed some such rate as one inch in one thousand years. When onr soils are gone we too must go, unless we shall find some way to feed on raw rock or its equivalent." So there is something in the story of the pleasant land. Search all the dictionaries through, comb... | |
 | 1915 - 936 páginas
...flourishing populations. Other long-tilled lands bear similar testimony. It must be noted that more than loss of fertility is here menaced. It is the loss...annually by our rivers, even when allowance is made for . . . material derived from the river channels, is an impressive warning, of the danger of negligent... | |
 | 1926 - 624 páginas
...flourishing populations. Other long-tilled lands bear similar testimony. It must be noted that more than loss of fertility is here menaced. It is the loss...annually by our rivers, even when allowance is made for . . . material derived from the river channels, is an impressive warning, of the danger of negligent... | |
 | United States. Congress. Senate. Committee on Agriculture and Forestry - 1936 - 390 páginas
...It must be noted that more than loss of fertility is here menaced. It is the loss of the soil body itself, a loss almost beyond repair. When our soils...raw rock or its equivalent : The immense tonnage of soil material carried out to sea annually by our rivers, even when allowance is made for laudable wash... | |
 | Russell Lord - 1940 - 338 páginas
...It must be noted that more than loss of fertility is here menaced. It is the loss of the soil body itself, a loss almost beyond repair. When our soils...to feed on raw rock, or its equivalent. . . . "The key lies in due control of the water which falls on each acre . . . The highest crop values will usually... | |
 | 1988 - 668 páginas
...Sci. Monthly 73 : 5-12. July 1908. The history and development of soil and its wastage are treated. "When our soils are gone, we, too, must go, unless...way to feed on raw rock or its equivalent . . . The key to the problem lies in due control of the water which falls on each acre . . ." Soil management... | |
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