Understanding the numbers on the fertilizer bags is essential before you can properly use the fertilizer. So let’s dig in. Master Gardener: Digging into the facts on fertilizer to better your garden ...

To find out how many pounds of that product to use on 1,000 square feet, divide 1 pound of nitrogen by the percentage of nitrogen in the bag. One divided by .22 gives you 4.5 lbs of fertilizer ...