So we are very new to this landscaping idea but enjoy it very much. 14 days ago we planted 20 pallets of turf grass hybrid bermuda sod and installed an irrigation system. The first week applied approximately 2.1 inches of irrigation and about half of that the second week. Most of the grass has turned a beautiful green as some is still yellow and seems to be fading fast. The irrigation system is hitting these spots at the same rate that the greener spots are getting watered. No fertilizer has been put down at this time. What would cause some of the spots to still be yellow?

Thanks so much for any response.