The answer to 'lawn mowing turning brown' is that there are several common causes, including improper mowing techniques, drought, disease, or nutrient deficiencies. The symptoms include patches of discolored, brown grass that can spread across the lawn.
To troubleshoot and fix this issue, first check your mowing habits. Make sure you're not cutting the grass too short, as this can stress the lawn and lead to browning. Adjust your mower blade height to the recommended 3-4 inches for your grass type. Proper mowing frequency is also important - aim to cut no more than 1/3 of the blade height at a time.
If the browning is due to drought, increase watering to 1-2 inches per week. For disease or nutrient issues, consider applying a lawn treatment or fertilizer, but consult a professional landscaper if the problem persists or covers a large area.