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10-27 Soil and Nutrition

10-27 Soil and Nutrition - Chapter37 SOIL&NUTRITON...

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10/28/2010 1 Chapter 37 SOIL & NUTRITON 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 & SOIL is key Answer is blowing in the wind 6.5 billion people rely on food grown on ~11% of global land surface y 3% of Earth’s surface contains fertile soil (dark and medium green areas) ??
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10/28/2010 2 Soil Profile Soil a living, finite resource Texture: size of particles Composition: inorganic & organic components Sustainable agriculture: conservation minded, environmentally safe & profitable 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 Macronutrients & micronutrients Eighteen essential elements identified by hydroponics Nine macronutrients (0.5% ‐45%) : C, H, O, N, S, P, Ca 2 + & Mg 2 + Eight micronutrients (<0.01%) : Cl‐, Fe 2 + & Fe 3 +, Mn 2 +, H 2 BO 3‐ , Zn 2 +, Cu+ & 2 +, Ni 2 +
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