Agriculture2011 - 9/20/2011 1 Growing our food...

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Unformatted text preview: 9/20/2011 1 Growing our food Environmental impacts of agriculture Pollinators in peril Southern Plains Video 1: Dust Bowl Era, Discovery Channel Video 1: Dust Bowl Era, Discovery Channel The Dust Bowl "Approximately 35 million acres of formerly cultivated land have essentially been destroyed for crop production. . . . 125 million acres of land now in crops are rapidly losing topsoil. . . 9/20/2011 2 Lessons from the Dust Bowl Era Soil is the key to food production Aggressive farming can cause soil erosion and intensify drought Government can encourage soil conservation Origins of agriculture: 10,000 yrs ago What do people eat? ~ 400,000 plant species known In US, 200 species grown as crops 14 spp. form bulk of human diets Wheat, rice, corn, potatoes, soy, Agroecosystems Monoculture Regular arrangement Plowed soils Chemical applications Soil Not just Dirt! Civilization itself rests upon the soil- Thomas Jefferson 9/20/2011 3 Soil profile (horizons) Litter Topsoil Subsoil Transition zone/parent material Soil erosion...
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This note was uploaded on 10/04/2011 for the course ECOL 1000 taught by Professor Altizer during the Fall '08 term at University of Georgia Athens.

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Agriculture2011 - 9/20/2011 1 Growing our food...

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