The nitrogen is from ammonium sulfate and ammonium phosphate, both materials are better at acidifying soil than urea. I face a similar situation in Hawaii. Many of the lawns and landscapes I maintain are on coral contaminated soil. Coral is just as good as limestone, with the added problem of sodium chloride. I get more green out of a custom formulated fertilizer containing ammonium sulfate, potassium nitrate, chelated micronutrients, and no phosphorus unless soil testing indicates need. In extremely alkaline soils, you might need to be applying up to 100 lb per year, not application of micronized sulfur prills.
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Benjamin Franklin Poor Richard's Almanac1738