Im thinking most on here will say no. Even with irrigation. Im debating on putting down a little bit over a quarter app just to help where I didn't get good coverage at the end of May. But im nervous doing that using 29-0-4 and irrigation. I personally wouldnt even consider it using straight urea. Temps should be a lot lower for that. Most guys on here dont fertilize during the summer. Unless its organic, or milorganite which technically isn't considered organic.