New turf starting to yellow
I've recently just laid my first turf over ~36m2, having previously been slabs. I've used POA Supina turf, used pre-turfing fertiliser and for the first 2-3 weeks it was all going really well, growing lovely, bright green and rooting nicely.
Unfortunately it's now started to yellow, at the tips and also some full length of the shoots also, I've attached some pictures. I've had the mower on the highest setting it has, that photo is 24 hours after the most recent mow.
Any ideas what might be causing this? Is it just one of those things or do I need to take action?