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To avoid problems with nitrogen burn in the future, use only slow-release fertilizers, spread the fertilizer uniformly over the lawn, do not spill or overlap the fertilizer and apply no more than 1 1/2 pounds of nitrogen per 1000 square feet of lawn with each application.
How To Treat Fertilizer Burn in Grass. If you have applied too much fertilizer to your lawn: 1  Remove Fertilizer: If youâve spilled granular fertilizer or can see it on the ground, grab a broom or wet/dry vac and get up as much as you can before it dissolves into the lawn. Different fertilizers come in different strengths, and itâs important not to over apply them to your lawn. 2  Reduce Lawn Stress: If the grass in your lawn is in poor condition, fertilize it very lightly to ease it back to health. 3  Resist the urge to feed heavily, since weak grass is easily burned by chemical fertilizers.