Lecture 30 Phosphorous

Lecture 30 Phosphorous - 1 Canned Food Drive Collection...

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Unformatted text preview: 1 Canned Food Drive Collection Wednesday in Class point bonus for each can up to 5 cans Phosphorous Phosphorous Importance Importance Essential Macronutrient (# 2 or # 3) Limiting Resource Present in Fertilizers and wastes Quantity/Quality Relationship (availability) 2 Organic Phosphorous Organic Phosphorous Components of soil organic matter and plant tissue Phosphate sugars Nucleic Acids (DNA/RNA) ATP Phospholipids ATP Fertility Fertility 10-15% of applied fertilizer phosphorous used by plants =>excess application =>saturation of soil capacity-Total soil phosphorous is low (1000 kg/HFS)-Most is unavailable to plants-Most soil forms of P are of low solubility (combine with cations in soil solution: Al, Fe, Ca, Mg) Deficiency Symptoms stunted, thin-stemmed- dark, bluish-green foliage P in solution: 0.8 mg/L N in solution: 60 mg/L Groups of P Compounds Groups of P Compounds Inorganic Fates-Plant Available-Fe, Al bound-Calcium bound-exchangeable- Fixed mineralization immobilization Plant Available P = 0.01% of total soil P Organic 3 Soil Phosphorous Soil Phosphorous PO 4-3 Inorganic H 2 PO 4- HPO 4-2 H 3 PO 4 (Orthophosphate) The form of available phosphorus is pH-dependent Plant Plant Availablity Availablity H 2 PO 4- HPO 4-2 pH 3-6 pH 8-11 pH 6-8 Optimum pH = 6.5 for mineral soils Most Available Acidic Soils 4 Acid Soils (Low pH) Acid Soils (Low pH) Aluminum and Iron availability increased at low pH Al(OH) 3 FeOOH Solubility increased Al 3+ Fe 3+ Al(OH) 3...
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This note was uploaded on 07/31/2011 for the course SOS 3022 taught by Professor Staff during the Fall '08 term at University of Florida.

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Lecture 30 Phosphorous - 1 Canned Food Drive Collection...

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