I had accidentally missed the corner of the garden during the last heat spell. The potatoes were overlooked. The irrigation is turned only when the stock tanks need to be filled and the error with the sprinklers caused the problem.
I’ll give them as much time as possible, but will soon be harvesting the half row and will continue to check sprinklers during the times that I have the irrigation running. (PS as you can see, the pig weeds have no problem growing with or without water, maybe I’m growing the wrong crop)