Zoysia (?) Yellowing...
Having issues with areas of my lawn yellowing.
I am located in Tulsa, OK. The sod on my lawn was laid before I purchased the house. I believe it is Zoysia. I have a sprinkler system and water 4 times a week, at night, 35 minutes in each area (not sure how to determine how many "inches of water" that is). I mow on setting 3.5 on my Honda mower, once every 10 days (approx).
This year, areas of my lawn are starting to yellow. Not sure what is causing it? Posting pics below of a green lush area of the yard, up close photo of the yellowing area, and a photo showing the entire yard to demonstrate how the yellowing is spreading.
Any suggestions or ideas on what could be causing would be appreciated.