The answer to 'lawn fertilization turning brown' is that excessive or improper fertilization can cause your lawn to turn brown. This is a common problem that can happen when the fertilizer is applied too heavily, the wrong type of fertilizer is used, or the fertilizer is applied at the wrong time of year.
Some key symptoms of over-fertilized, burnt lawn include brown or yellow patches, a thin or patchy appearance, and a generally unhealthy look. The solution is to adjust your fertilization routine - apply the right type and amount of fertilizer at the appropriate times for your climate and grass type. If the problem persists, it's best to call a professional landscaper to diagnose and treat the issue.