While visiting with a dealer last week, I discussed the attributes of different sulfur fertilizer sources.  The final choice between ammonium sulfate and calcium sulfate came down to the cost for a unit (#) of sulfate sulfur.  Here is what my calculations showed (these prices are not suggested to be indicative of every particular situation, but only an example):

Ammonium sulfate (AMS), 21-0-0-24S, was costing $0.75 per unit of sulfur (nitrogen value set to 0).

Calcium sulfate (SO4), 0-0-0-17S-22Ca, was costing $0.59 per unit of sulfur (calcium value set to 0).

If the sulfur requirement for 5 Ton alfalfa removal is 30# (6# sulfur per Ton), the cost for sulfur nutrition from AMS was $22.50 per acre, with the SO4 providing the same 30# of sulfur, but for a cost of $17.70 per acre.  Net difference (savings) to the grower of $4.80 per acre.

Not a huge difference, but still a 20% decrease in cost.  With the economic challenges of livestock production today, every little bit helps.

SuperCal SO4, the right fit, right now.