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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. GrassLbs. N/1,000 ft 2 /Yr Common bermuda4 - 5 Hybrid bermuda5 - 6

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P k

N

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S

Ca Mg

Fe

B Cl Cu Mn Mo Zn

Essential Turfgrass Nutrients


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Nitrogen

  • Organic Matter (O.M.)

  • Fertilizers


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Nitrogen Requirements

GrassLbs. N/1,000 ft2/Yr

Common bermuda4 - 5

Hybrid bermuda5 - 6

St. Augustine (Sun)3 - 4

St. Augustine (Shade)2 - 3

Zoysia2 - 3

Tall Fescue3 - 4

Buffalograss1 - 2

Centipedegrass1 - 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 Greenery100% Natural Based Fertilizer

14 - 2 - 4 81% Natural Organic

7% Natural Inorganic (Mineral)

Per 100 lbs. by Weight% of the Nutrients

12 lbs. Urea40% of the N

54 lbs. Feather Meal50% of the N

12 lbs. Blood Meal10% of the N

15 lbs. Bone Meal100% of the P2O5

7 lbs. Sulfate of Potash100% 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+ + O2NO2-

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


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Denitrification

  • NO3- NO2-N2ON2

  • Occurs under the following conditions:

  • Low oxygen concentration

  • High soil moisture

  • Alkaline soils

  • High temperatures


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