Fertilizers aren't medicines
Fertilizers are not plant food in the sense that the plant roots eat the fertilizer particles. The nutrients must dissolve so the plant roots can absorb them in a liquid form. The plants do not distinguish whether the nutrients are supplied in a chemical or synthetic form or from organic residues.
Fertilizers are not plant medicines. They are nutrients that help healthy plants grow. Fertilizing a sick plant is like force-feeding a sick animal. It will often kill the plant instead of curing it.
Pre-emergence herbicide/fertilizer combinations are very effective against many annual weeds. You must apply most products before the seeds germinate. Most of the newer products work for a much longer time and can be applied now. Aerate your lawn if needed before applying the herbicide.
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