[Edit: The original post specified that it was a lime tree, but I am happy to give it's name, rank and serial. no. It is a thornless Mexican lime, Citrus aurantifolia, and has been in the ground there for a bit over a year.]
Yep. We do pee on mulched trees around here, after a watering. AZ soil needs nitrogen, the UofA said so (and it's kinda obvious). This is a lime, located just off the back porch.