The answer to 'best lawn fertilization' is to fertilize your lawn 2-3 times per year with a balanced, slow-release fertilizer. This will provide your grass with the nutrients it needs to stay healthy and green throughout the growing season. The best times to fertilize are in early spring, late spring, and early fall.
When choosing a fertilizer, look for one that has an N-P-K ratio of around 10-10-10 or 12-12-12. Apply the fertilizer according to the instructions on the package, typically spreading it evenly across your lawn using a broadcast spreader. Be sure to water the lawn thoroughly after application to help the fertilizer soak in.