Originally Posted by turfmd101
With each sulfate mentioned. Applying them at rate would give you about 1# of sulfur per 1000sq. from both.
This amount seems low at 0.1lb per 100sq ft. What's the pH change? 0.0...what? Or is my math incorrect. My info is based on label percentages of sulfur for AS and PS.
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Looks like your math is off a bit. At rate assuming your rate is 1 lb N you would be getting 1.14 lb of sulfate. The sulfate form of sulfer does not lower Ph of soil so that is a mute point anyway. Sulfur needs to be in the elemental form to effectively lower Ph. The acid forming process of fertilizer occurs when the ammonium converts to nitrate. Since ammonium sulfate is 100% ammonium it is about 2x more acidifying than other forms of nitrogen.