A Documentary History of Conservation in America |
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Page 137
... soil within a year . So it would take two hundred and twenty - five years for this soil to acquire as much of these saline ingredients as the rich soil of Holland already possesses . We might go further into this subject and show that ...
... soil within a year . So it would take two hundred and twenty - five years for this soil to acquire as much of these saline ingredients as the rich soil of Holland already possesses . We might go further into this subject and show that ...
Page 171
... soil , the colonists use it as such as long as it will bear any crops ; and when it ceases to bear any , they turn it into pastures for the cattle , and take new grain fields in another place , where a rich black soil can be found and ...
... soil , the colonists use it as such as long as it will bear any crops ; and when it ceases to bear any , they turn it into pastures for the cattle , and take new grain fields in another place , where a rich black soil can be found and ...
Page 198
... soil : erosion and the loss of fertility due to mining the soil for crops . Soils which have been building steadily for 20,000 years since the last ice age now in a single century lose the benefits of several thousand years of ac ...
... soil : erosion and the loss of fertility due to mining the soil for crops . Soils which have been building steadily for 20,000 years since the last ice age now in a single century lose the benefits of several thousand years of ac ...
Contents
Awareness of the Living World | 3 |
MANS DOMINION | 97 |
THE FLAMING SWORD | 267 |
Copyright | |
2 other sections not shown
Common terms and phrases
abundance acres agriculture Aldo Leopold American animals areas beauty become birds buffalo busy monster Canaan Mountain century Charles Galton Darwin chemical cities civilization coal conservation conservationism crops desert Ducktown E. E. Cummings earth ecological ecologist economic environment environmental farm feet fertility fields fish forest future Gerard Piel grass green ground grow growth hills human hundred increase Indians industrial insects John Muir kill lake land land ethic landscape live look man's Mark Van Doren means ment miles million Mississippi mountain National Park nature nature's ocean parathion perhaps pesticides plain plants poison pollution population portions preserve problem produce region reservoirs rich river road rock selection soil spring streams things Thomas Cole thousand timber tion town trees valley vast vegetable Wasichus waste wild wilderness wind woods