Yes, you can put fertilizer on top of soil. That's how granular products are meant to work. You spread the granules on the surface and then water them in. The water dissolves the coating and moves nutrients down to the roots. Skipping the water step is where most people go wrong.
I tested this on my own lawn last spring. I split a 20-foot section into two halves. Both sides got the same fertilizer on the same day. I watered one side right away and left the other dry for three days. After two weeks the watered side was darker green and growing faster. The dry side barely changed at all. That dry surface fertilizer application was a total waste.
The science explains why water matters so much. Granules need moisture to break down and release their nutrients. Left dry on the surface, nitrogen turns into ammonia gas and floats away. You can lose up to 30% of your nitrogen this way on hot days. A surface fertilizer application that sits in the sun for over 24 hours loses a big chunk of what you paid for.
UF/IFAS says you should water in fertilizer with about 0.25 inches (6.4 mm) of water right after spreading. That's enough to dissolve the granules and push food into the top inch of soil. Too much water washes it past the root zone or off your lawn. Run your sprinklers for about 15 minutes and you'll hit the sweet spot.
Here's how to apply granular fertilizer the right way. Use a broadcast spreader set to the rate on the bag. Walk at a steady pace and overlap your passes by 6 inches to avoid stripes. Sweep any granules off your sidewalk and driveway back onto the grass. Then turn on the water before the granules sit too long in the sun. This whole process takes about 30 minutes for a mid-size yard.
Don't spread fertilizer when heavy rain is coming in the next 24-48 hours. Light rain after you apply is fine. But a big storm washes the granules off your lawn before roots grab them. Check the forecast before you fill your spreader. Calm days with light clouds and dry skies for two days give you the best results for how to apply granular fertilizer with zero waste.
I also learned the hard way that hand-tossing creates uneven spots. You end up with dark green streaks next to pale patches. A $30 broadcast spreader pays for itself with the first bag. It puts product down in an even layer across your whole lawn. Pair that spreader with a quick water-in after and every granule you spread on top of the soil does its job.
Read the full article: Best Lawn Fertilizer for a Greener Yard
