10-27 Soil and Nutrition

10-27 Soil and Nutrition - 10/28/2010 Chapter37...

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10/28/2010 1 Chapter 37 The soil ecosystem More than 6.5 billion people rely on food grown on ~11% of global land surface “It’s the SOIL” 7 billion people by 2011. By 2030, estimate 8.3 billion people on Eart Will need to provide ~30% more food Answer is blowing in the wind 6.5 billion people rely on food grown on ~11% of global land surface ly 3% of Earth’s surface contains fertile soil (dark and medium green areas) ??
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2 Soil Profile Soil a living, finite resource Texture: size of particles Sustainable agriculture: conservation minded, Irrigation: water often limiting factor for growth Fertilization: no recycling: add N, P, K pH: 6 to 8 influences availability of minerals Erosion: Dust bowl Phytoremediation Eighteen essential elements identified by hydroponics Nine macronutrients (0.5% ‐45%)
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This note was uploaded on 02/06/2011 for the course BIO 120 at USC.

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10-27 Soil and Nutrition - 10/28/2010 Chapter37...

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