Pamphlets on Conservation of Natural Resources, Volumen18U.S. Government Printing Office, 1909 |
Dentro del libro
Resultados 1-5 de 100
Página 234
... soils productive and plays an indispensable role in the life cycles of many plants . Plant cover , in turn , provides essential protec- tion to the soil against the erosive force of water and wind . Weaken one link and the whole life ...
... soils productive and plays an indispensable role in the life cycles of many plants . Plant cover , in turn , provides essential protec- tion to the soil against the erosive force of water and wind . Weaken one link and the whole life ...
Página 235
... soil of a farm below than poor cultivation of the farmland itself . When forests are clean - cut from a slope , the soil is bared to sun and frost , and the protective layer of vegetation that has held the rain and snow is removed ...
... soil of a farm below than poor cultivation of the farmland itself . When forests are clean - cut from a slope , the soil is bared to sun and frost , and the protective layer of vegetation that has held the rain and snow is removed ...
Página 241
... Soil Loss ( lbs ) Percent of Runoff Potato field , rows down slope ... 14 Grass 20 .... Forest 27 ... 1055 88 0 0.2 0 0.5 One reason for high soil loss and runoff on the potato field was that the ground was frozen while the grass and ...
... Soil Loss ( lbs ) Percent of Runoff Potato field , rows down slope ... 14 Grass 20 .... Forest 27 ... 1055 88 0 0.2 0 0.5 One reason for high soil loss and runoff on the potato field was that the ground was frozen while the grass and ...
Página 249
... soil inventory the abundance may prove to be illusory ? These are all good subjects for discussion . But before reaching conclusions , let us consider the nature and condition of our soil inventory . It may be helpful to approach this ...
... soil inventory the abundance may prove to be illusory ? These are all good subjects for discussion . But before reaching conclusions , let us consider the nature and condition of our soil inventory . It may be helpful to approach this ...
Página 250
... the condition of our productive soils . Since early colonial times we have ruined for further cultivation or severely damaged 200 million acres of good land formerly under cultivation . Soil erosion is a natural process ; it occurs over 22.
... the condition of our productive soils . Since early colonial times we have ruined for further cultivation or severely damaged 200 million acres of good land formerly under cultivation . Soil erosion is a natural process ; it occurs over 22.
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Términos y frases comunes
acres agencies Agriculture annual areas bill boys Bureau CAGNEY camp Chairman Civilian Conservation Corps Commission committee Congress conservation movement Construction cooperation coordination cost Council delinquency Department Douglas-fir economic enrollees existing facilities Federal Government fire Forest Fire forest land FOREST PROTECTION Forest Service forestry Gifford Pinchot Governor habitat important improvements increase industry Insect and Disease interest Interior January 26 juvenile Kalamazoo River labor legislation Maintenance Management and administration ment miles million acres mineral national forests national-forest natural resources organization parks percent plans planting population present President problems production proposed recommendations recreation Reforestation regional resource development Resource Management Resources and Conservation responsibility river roads and trails Senator CLARK Senator Humphrey SENATOR MURRAY Senator RANDOLPH Silviculture statement streams surveys Theodore Roosevelt Timber purchasers tion U.S. Senate United utilization Washington watershed welfare wildlife young Youth Conservation Corps