That is if it's put out as a granular broadcast at 50lbs per acre. ($27-30 per bag is what I'm getting it for), but most apply it as a foliar spray, and 1 bag will do 10 acres at a rate of 5lbs per acre to 20 gallons of water. Some only use 4lbs which would do 12 acres per bag. The foliar application goes much further with quicker results, but won't last quite as long as the granular. Some people put out the granular the first couple years along with a foliar application, and then foliar only once the minerals have been added back to the soil.