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Crop Code No. 105

 

 

 

 

 

St. Augustinegrass

Soil Groups 1, 2, 3, or 4                                                         

 

 

 

 

Desired pH 5.5-6.0

Phosphorus

Potassium

 

Low

Medium

Sufficient

High

Excessive

 

pounds of N-P2O5-K2O per acre

Low

80-10-20

80-10-20

80-10-0

80-10-0

80-10-0

Medium

80-  0-20

80-  0-20

80-  0-0

80-  0-0

80-  0-0

Sufficient

80-  0-20

80-  0-20

80-  0-0

80-  0-0

80-  0-0

High

80-  0-20

80-  0-20

80-  0-0

80-  0-0

80-  0-0

Excessive

80-  0-20

80-  0-20

80-  0-0

80-  0-0

80-  0-0

COMMENTS (1, 71, 72, 105, 319, 562, 650, 651, 652, 653)

71  Apply 220 lbs Epsom Salts (magnesium sulfate) per acre or a fertilizer containing magnesium.  (When lime is not recommended and soil test magnesium is low)

72  Apply 435 lbs gypsum per acre or as a mixed fertilizer containing sufficient calcium to supply 100 lbs calcium per acre.  (When lime is not recommended and soil test calcium is less than  400 lbs calcium per acre)

319  To achieve better color, foliar apply on the turf a liquid solution of iron sulfate (dissolve 5 pounds iron sulfate in 160 gallons of water) including a surfactant (1/8 cup of a dishwasher detergent) per acre, or foliar apply a chelated iron source following label instructions.  A foliar iron treatment should be made in either April or July for locations in the Piedmont and in March, July or September for locations in the Coastal Plain.  Foliar apply the iron-containing solution in the late afternoon and only when the air temperature is greater than 80oF and soil moisture is adequate for good turf growth. 

562   In the spring when the grass is fully green, apply slow-release nitrogen fertilizer.  Do not over fertilize or apply fertilizer after August 15.