Correct, sandy soil and high soil temps as well. The study was indeed conclusive on the cause. What I would like to see (and will continue to study myself) is a corrective action.
Also, water definitely contributes, in fact overwatering is an obvious contributor. Double edged sword though. Water enough to keep from drying out and this is what you get. I believe the key factor is the high pH of the soil. Getting pH down to allow the turf to utilize the iron (and keep it down) I think is the first step.
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