Clean ammonium sulfate granules is pretty soluble in water. 2 lb will dissolve in 1 gallon. Does not mean it is a good idea to apply 21/2 gallons of such a mix to a lawn. 5-10 gallons is a safe volume for fertilizer applications over 1/4 lb N. Golf courses apply 1/10-1/4 lb N in 2-3 gallons. But as Ric said, that is on a 14 day application schedule.
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Benjamin Franklin 1775
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Benjamin Franklin Poor Richard's Almanac1738