2nd most important thing next to water... pH
If the pH is off by much from the "comfort" range for zoysia, micro nutrients will not be absorbed. No matter what problems you find and fix with your sod, test your soil and manage your pH to get the most out of the fertilizers and water you use.
The average pH I have found testing in TV is around 7.2, a bit alkaline for zoysia. I would test a 10 x 10 with a light coffee application. if you see improvements in the following couple weeks... treat everything.
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