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N. P K. S Ca Mg. Fe. B Cl Cu Mn Mo Zn. Essential Turfgrass Nutrients. Nitrogen. Organic Matter (O.M.) Fertilizers. Nitrogen Requirements. Grass Lbs. N/1,000 ft 2 /Yr Common bermuda 4 - 5 Hybrid bermuda 5 - 6

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  1. N P K S Ca Mg Fe B Cl Cu Mn Mo Zn Essential Turfgrass Nutrients

  2. Nitrogen • Organic Matter (O.M.) • Fertilizers

  3. Nitrogen Requirements Grass Lbs. N/1,000 ft2/Yr Common bermuda 4 - 5 Hybrid bermuda 5 - 6 St. Augustine (Sun) 3 - 4 St. Augustine (Shade) 2 - 3 Zoysia 2 - 3 Tall Fescue 3 - 4 Buffalograss 1 - 2 Centipedegrass 1 - 2

  4. Nitrogen Sources • Soluble Nitrogen • Slow Release Nitrogen • Organic Nitrogen

  5. Soluble Nitrogen Sources • Urea • Ammonium Sulfate • Potassium Nitrate • Ammonium Nitrate

  6. Slow ReleaseNitrogen Sources • Urea — formaldehyde (UF) • Isobutylidene diurea (IBDU) • Sulfur coated urea (SCU) • Polymer coated nitrogen

  7. Organic Fertilizer • A material containing carbon and one or more elements other than hydrogen and oxygen essential for plant growth

  8. Example: Natural Based Fertilizer Chuck’s Greenery 100% Natural Based Fertilizer 14 - 2 - 4 81% Natural Organic 7% Natural Inorganic (Mineral) Per 100 lbs. by Weight % of the Nutrients 12 lbs. Urea 40% of the N 54 lbs. Feather Meal 50% of the N 12 lbs. Blood Meal 10% of the N 15 lbs. Bone Meal 100% of the P2O5 7 lbs. Sulfate of Potash 100% of the K2O

  9. Factors AffectingNutrient Availability • Oxidation = reduction state of the nutrient • FE +2, Fe +3 • Concentration of the nutrient • Water content of soil • Oxygen • Temperature • pH

  10. Nitrification NH4+ + O2 NO2- NO2 + O2 NO3- • Concentration of the nutrient • Water content of soil • Oxygen • Temperature • pH

  11. Nitrate (NO3-) is lostfrom soil by: • Leaching • Soil microorganisms • Taken up by grass • Denitrified

  12. Denitrification • NO3- NO2- N2O N2 • Occurs under the following conditions: • Low oxygen concentration • High soil moisture • Alkaline soils • High temperatures

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