The Physical Basis of SocietyD. Appleton, 1916 - 406 من الصفحات |
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الصفحة 11
... soils { 3. Alluvial 4. Glacial 5. Wind - blown , sand dunes , loess Soils of these various types will have different char- acteristics . The soil particles will vary in size from clay , so fine that it can scarcely be measured , to ...
... soils { 3. Alluvial 4. Glacial 5. Wind - blown , sand dunes , loess Soils of these various types will have different char- acteristics . The soil particles will vary in size from clay , so fine that it can scarcely be measured , to ...
الصفحة 12
... soil depends in part upon the amount of these present . If one essential is lacking , growth is checked , no matter how abundant the other elements . In thirty - four soils analyzed by American chemists , the first eight inches of soil ...
... soil depends in part upon the amount of these present . If one essential is lacking , growth is checked , no matter how abundant the other elements . In thirty - four soils analyzed by American chemists , the first eight inches of soil ...
الصفحة 13
... soil . It is sour , as he says . From the standpoint of the farmer , the soils have other important features . Some of the richest alluvial soils are so level that adequate natural drainage does not exist . Other districts are so hilly ...
... soil . It is sour , as he says . From the standpoint of the farmer , the soils have other important features . Some of the richest alluvial soils are so level that adequate natural drainage does not exist . Other districts are so hilly ...
الصفحة 18
... soil . Fog may bring little precipitation , but may produce many of the same effects and be very helpful , while dew prevents freezing ofttimes and also furnishes moisture . Granted then an adequate rainfall , under given conditions ...
... soil . Fog may bring little precipitation , but may produce many of the same effects and be very helpful , while dew prevents freezing ofttimes and also furnishes moisture . Granted then an adequate rainfall , under given conditions ...
الصفحة 45
... soil and builds new land for future men . That this process may involve serious loss to exist- ing society is also evident . Now all these changes , whether the yearly cycle of temperature , or the greater pulsations as they have been ...
... soil and builds new land for future men . That this process may involve serious loss to exist- ing society is also evident . Now all these changes , whether the yearly cycle of temperature , or the greater pulsations as they have been ...
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