T15-16+Slides

T15-16+Slides - Soils as a Media for Plant Growth Nutrient...

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1 Soils as a Media for Plant Growth & Nutrient Management Air Quality Soil Quality H 2 O Quality Food Quality Role of soil in plant growth Support Water Aeration (O 2 ) Nutrients 56 43.6 2.0 0.03 Carbon 3.11 0.20 0.10 0.12 Phosphorus 8.8 1.0 0.1-1.0 0.002 Nitrogen 0.47 0.009 0.6 2.8 Sodium 4.67 0.23 1.4 3.6 Calcium 0.012 0.08 3.8 5.1 Iron 0.1 7.1 8.1 Aluminum 0.005 1.2 33 27.7 Silicon 14.6 44.4 49 46.5 Oxygen ----------------------------------------- % ----------------------------------------- Element Humans Corn Soil Geosphere Composition of the geosphere, soil, plants and humans 17 Ni Plant Essential Nutrients 1 10 1 10 2 10 4 10 5 10 6 10 7 10 3 Mo N OC H SPM gKC a ZnMnFeB Cl Ni Cu Relative Number of Nutrient Elements in Plants Macro Micro Rocks Air Air - SOM
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2 Plant Nutrient Uptake Root Uptake Foliar Uptake Mobile versus Non-mobile Non-mobile: young foliage Mobile: old foliage Microbes Litter Soil Organic Matter Vegetation Mycorrhizae Decomposition Soil Solution Primary minerals Secondary minerals Weathering Synthesis Litterfall U p t a k e Sorbed S o rp tio n D s Leaching Exchangeable Ions Exchange Im m b iliz M in ra liz L f w h & E x u d Gaseous Inputs/Outputs Atmospheric Deposition Wet Dry Atmosphere Biosphere Geosphere Hydrosphere Fresh Tephra 10 Years of Weathering Nutrients are released over 100,000 yrs Year following ash addition 1234 Element (kg ha -1
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T15-16+Slides - Soils as a Media for Plant Growth Nutrient...

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