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Unformatted text preview: Day 14 a- Impact of Potatoes a- General variety in plants- natural protection from disease b- Andes has > 7,000 varieties of potatoes. Genetic diversity allows smaller % of famine c- Limited varieties taken to Europe d- Central to Irish diet e- Blight 1840-insufficient genetic variety- wiped out potatoes =>famine f- Potatoes- 4 th most important food crop globally after corn, wheat and rice. 2 nd highest number of calories per acre. Mainstay in Africa and Asia. China # 1 producer, Russia #2, India #3 b- Agricultural Land Use a- Intensive-mixed cropping integrated into a small area of land 1-interspecific polyculture-mixing complementary plants such as maize and bananas with a groundcover or tuber and climbing vine such as beans (nitrogen fixers) b- If wetlands area, may mound up soil and have fish in surrounding water for protein and fertilizer. In highlands, temperatures extreme. c- Slash/burn Sweden d- Black Earth- regions of Amazon where soil has been altered e- Extensive large use of land for row cropping, orchards, grazing etc. Extensive large use of land for row cropping, orchards, grazing etc....
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This note was uploaded on 02/12/2011 for the course GEOG 101 taught by Professor Pavlovskaya during the Fall '08 term at CUNY Hunter.
- Fall '08