Check out the PDF publications available at the University of Arizona Cooperative Extension website link. If you are trying to decide what's wrong with your citrus tree, search for "citrus" on their site or on the web look for "Low Desert Citrus Varieties AZ 1001" to get a listing of varieties of citrus that do well in our Valley and their characteristics.
There's also a vegetable planting calendar for Maricopa County. Search for "vegetable" to find it (Vegetable Planting Calendar for Maricopa County AZ 1005).
There is also information on how much to water lawn, citrus trees, and how to design a drip irrigation system. It isn't the friendliest search site, as I can find some of the publications more easily on the web, but it's there if you look through the results along with a dozen other articles that may catch your interest. Very informative and tuned specifically to our area.
New USDA plant hardiness zone map is now available on line. The Phoenix area is Zone 9b.
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