ES 10_21_09 Agriculture

ES 10_21_09 Agriculture - 10/22/09 Agriculture Sunlight...

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10/22/09 1 Agriculture • Sunlight energy • Air – CO 2 – O 2 into soil • SOIL – Support, water, O 2, nutrients • Water US Soil Erosion Due to overcultivation, overgrazing and deforestation, about 1/3 of nation’s prime topsoil has been washed away Dust Bowl – 1935 Soil Erosion Act – Due to conservation measures, soil erosion decreased by 40% between 1985 and 1997
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10/22/09 2 Global Soil Erosion • Topsoil eroding faster than it forms on 1/3 of the world’s cropland • Most of the degraded lands are in Asia and Africa • New Initiative: Global Soil Map! – GlobalSoilMap.net Soil Erosion in Ethiopia
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10/22/09 3 Tilling the Land ! Grazing
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10/22/09 4 Planting Sloped Land Towns (Market)
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10/22/09 5 Deforestation Children Help Farm
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10/22/09 6 Soil Profile Soil
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7 Development of Soil • 200 to 1,000 years for 1” • Most crops grown where grasslands, deciduous forest were
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ES 10_21_09 Agriculture - 10/22/09 Agriculture Sunlight...

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