Readings in Wildlife ConservationJames Allen Bailey, William Elder, Ted D. McKinney Wildlife Society, 1974 - Всего страниц: 722 |
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Стр. 49
... crop production by about 25 per cent by 1975. " The greatest increase needed in crop production would be in field crops , feed grains , hay , soybeans , and especially pasture . Crops for which little or no increase in production would ...
... crop production by about 25 per cent by 1975. " The greatest increase needed in crop production would be in field crops , feed grains , hay , soybeans , and especially pasture . Crops for which little or no increase in production would ...
Стр. 479
... crop . The magnitude of this crop must obviously be controlled if excessive exploitation is to be avoided . Controlling the magnitude of the crop is one major objective in adminis- tration of fish and wildlife resources . At the same ...
... crop . The magnitude of this crop must obviously be controlled if excessive exploitation is to be avoided . Controlling the magnitude of the crop is one major objective in adminis- tration of fish and wildlife resources . At the same ...
Стр. 527
... crop insurance available through the Federal Crop Insurance Corpora- tion of the U.S. Department of Agriculture includes losses to bird depreda- tions among the items eligible for payment . The arrangement is different from that in ...
... crop insurance available through the Federal Crop Insurance Corpora- tion of the U.S. Department of Agriculture includes losses to bird depreda- tions among the items eligible for payment . The arrangement is different from that in ...
Содержание
PERSPECTIVES | 1 |
Thinking like a mountain | 9 |
Lost margins in the abandoned farm | 19 |
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Readings in Wildlife Conservation James Allen Bailey,William Elder,Ted D. McKinney Просмотр фрагмента - 1974 |
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acres adult agencies animals annual areas Barbary sheep behavior big game biological biologists birds black-tailed deer breeding burning Canada Canada geese caribou carrying capacity changes chaparral conservation cost crop Dall sheep diversity ecological economic ecosystem effects environment example exotic experience factors farm fertility Fish and Game fish and wildlife forage forest game management geese goose groups grouse growth habitat harvest herd hunters hunting important increase individual kill land Leopold limited living mallards marshes ment method Mississippi Flyway moose mortality muskrats National Park natural organic Park Service percent plants population density prairie predation problem production quail recreation refuge reproductive result ruffed grouse season seed sharecropping shrubland social soil species sport square miles succession territory tion types ungulates unit vegetation waterfowl white-tailed deer wild Wildl wildlife management wildlife resources winter range wolf wolves