Answer: If only certain areas are turning yellow they are either sitting in high or low places, or the roots are not making good contact with the soil. If the areas are too low, water will puddle under the sod and suffocate the roots. If the areas are too high, water won't reach the roots of the plants. If the roots of the sod cannot make good contact with the soil, they won't get the moisture they need. Take a shovel out and cut between the green and the yellow and see if you can pull the yellowed sod up. If so, it hasn't rooted well. If not, it is rooted but the spot is either too high or too low. Once you fix the soil so that it is level, the grass should be happier and green up well in time. Good luck with your lawn.
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