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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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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 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


Nitrogen sources
Nitrogen Sources

  • Soluble Nitrogen

  • Slow Release Nitrogen

  • Organic Nitrogen


Soluble nitrogen sources
Soluble Nitrogen Sources

  • Urea

  • Ammonium Sulfate

  • Potassium Nitrate

  • Ammonium Nitrate


Slow release nitrogen sources
Slow ReleaseNitrogen Sources

  • Urea — formaldehyde (UF)

  • Isobutylidene diurea (IBDU)

  • Sulfur coated urea (SCU)

  • Polymer coated nitrogen


Organic fertilizer
Organic Fertilizer

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


Example natural based fertilizer
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


Factors affecting nutrient availability
Factors AffectingNutrient Availability

  • Oxidation = reduction state of the nutrient

  • FE +2, Fe +3

  • Concentration of the nutrient

  • Water content of soil

  • Oxygen

  • Temperature

  • pH


Nitrification
Nitrification

NH4+ + O2 NO2-

NO2 + O2 NO3-

  • Concentration of the nutrient

  • Water content of soil

  • Oxygen

  • Temperature

  • pH


Nitrate no3 is lost from soil by
Nitrate (NO3-) is lostfrom soil by:

  • Leaching

  • Soil microorganisms

  • Taken up by grass

  • Denitrified


Denitrification

  • NO3- NO2- N2O N2

  • Occurs under the following conditions:

  • Low oxygen concentration

  • High soil moisture

  • Alkaline soils

  • High temperatures


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