The Agricultural World - pcmac：农业是世界pcmac.pptVIP

Agricultural ecology Cultural adaptation How weather and climate probably exert the greatest influence on different forms of agriculture Cultivation of frost-sensitive crops is very expensive outside tropical areas Plantation agriculture thrives because it produces cash crops wanted by people in the middle latitudes where the crops cannot grow Market gardening in the southern and southwestern United States provides citrus fruits, winter vegetables, and other crops to the urban markets of the Northeast Agricultural ecology Cultural adaptation Need for abundant irrigation water confines paddy rice farming to its present limits in Asia Soils also play an important role in agricultural decisions Shifting cultivation reflects an adaptation to poor tropical soils The practice of peasant grain, root, and livestock agriculture is often successful because of the long lasting fertility of local volcanic soils Terrain influences agriculture because farmers tend to crop farm in level areas Agricultural ecology The subtle influence of farming in marginal areas Paddy rice farmers developed complex strategies to avert periodic famine because of unreliable rainfall, which included many varieties of rice Farmers in Thailand rejected the Green Revolution because its methods were not appropriate for their marginal lands Example of West Africa Many crops are grown in the more humid lands near the coast Moving inland, only a few drought-resistant basic crops are grown Agricultural ecology Many geographers believe we must cease imposing Western innovations on farmers in the less-developed countries Traditional agriculture and resource management merit serious consideration We should stop assuming our innovations are superior to the old ways We have caused irretrievable loss of traditional farming knowledge Agricultural ecology Agriculturists as modifiers of the environment Started after the domestication of plants and animals Natural vegetation has been altered in a major way To the hunt