One 40 pound bag
Pennington Pelletized Dolomitic Limestone will treat 1,000 square feet. Therefore, if you only need to treat about 300 sq ft then you would only need to use about 12-13 lbs of Pennington Pelletized Dolomitic Limestone spread evenly over that 300 sq ft area. For help with spreader settings we recommend contacting the manufacturer of the spreader as all spreaders and applicators are different and wak at different paces.