The answer to 'sod yellowing' is that it is a common issue that can have several underlying causes. Sod can turn yellow due to nutrient deficiencies, improper watering, disease, or other environmental stressors. The symptoms may include patchy discoloration, wilting, or a general loss of vibrancy in the lawn.
In many cases, sod yellowing can be addressed through simple DIY steps like adjusting your watering schedule, applying fertilizer, or treating for pests or disease. However, if the problem persists or you're unsure of the root cause, it's best to consult a professional landscaper who can properly diagnose and address the issue.