It might be time to start thinking about fertilizer. Really now through October is a good time to fetilize trees. I suggest you fertilize 3 times a year. Once in the early spring (Feb), then in Spring (May) and then again in the fall (aug-Oct). Apply Nitrogen to your fall ripening trees (oranges and tangerines).
August is a great time to plant one more crop of quick growing vegetables like radishes.
Enjoy the summer.