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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.
It is composed of four basic steps: nitrogen fixation, nitrification, ammonification, and denitrification. During nitrogen fixation, nitrogen gas from the air is converted into ammonium. During nitrification, ammonium is converted into nitrates, which are taken up by plants. The nitrates are used by the plants and animals, then returned to ammonium using ammonification.