Answer: It is extremely difficult to make a recommendation about watering because so much depends upon your soil type and, of course, the weather. Tree size also factors into the formula. So, rather than lead you astray, here's a comprehensive publication from Arizona State University which addresses all of the above and helps you determine, with the aid of a chart, just how much water your particular tree will need. http://www.ag.arizona.edu/pubs/crops/az1151.pdf
Hope you find it helpful.
Q&A Library Searching Tips