re: Help Interpreting a Soil Test for Lawn

Nitrogen is just applied as needed. It affects how often you mow and color. Don't really need that much.

Slow release would be better because you won't get that flush of growth right after application. 3 pounds of nitrogen per 1000ft/sq per year during growing season would be good enough for a lawn. If the area gets more traffic a little extra nitrogen can give it a boost. I would spread nitrogen applications over a few times a year, maybe 4-5 times. Never put down more than 1 pound at a time.

Phosphorus stays in the soil, doesn't leach, and can't really hurt if too much is put down. Potassuim will leach out of the soil or be in a unavailable form to the roots. Feel free to put more of those two down than recommended.