Why is half the practice tee green and the other half straw brown?

With the change over to hybrid Bermudagrass at the practice tee, we are always trying to extend growth and color as late in the year as possible. These pictures show the results of material called Civitas. This was after the 2nd of two applications(early Nov.). I assumed that the color would fade by early December but I was surprised that the blue\green effect was still strong on Dec. 20th.
This test case could yield valuable information on managing the Bermudagrass practice area in the future.