Here are some simple fertilizer tips for your lawn that are proven and effective. April was soaking wet and with the warm weather now, the turf is generally growing faster than you can mow. If your lawn is still actively pushing upward, I’d actually consider waiting a week or two before putting down a fertilizer application. No need to force any additional top-growth beyond what the plant is already doing.
Select a fertilizer that contains slow release nitrogen sources. Slow release fertilizers include coated ureas, methylene ureas or natural organics. Slow release fertilizers provide sustained feeding of the turf over the summer months. Avoid single, heavy dose applications of water-soluble, fast release fertilizers such as urea or the triple products (fertilizers with N, P, K, analysis such as 10-10-10). Fast release fertilizer will give you instant satisfaction with dark green color and quick growth response, but won’t last long and the top-growth they increase can actually reduce root growth. Really.
Michigan State University Extension