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S04 Humic Calcium Sulfate with (15% humic soluble) is a pelletized gypsum and humic acid blend, applied to turfgrass to increase plant root mass, repair sodic soils, and improve soil structure, which promotes nutrient uptake and stress tolerance. SO4 Humic is manufactured from an extracted, highly soluble humic acid powder and pure dihydrate gypsum.


Apply early Spring & Late Fall to flush salt build up from the winter salting, fertilizing & the pet urine.


Apply 98G Calcitic Lime 2 weeks after your Gypsum application to restore soil pH.


Bag Size: 50 lbs


Application Rate: 10 lbs./1,000 sq.ft.

S04 Humic (Gypsum)

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