Avocado trees really thirsty?
I'm in the process of reconfiguring our backyard planter irrigation to use drip irrigation. All of the planter areas are on a common automatic sprinkler valve. This is a problem because our Hass Avocado tree needs significantly more water.
The question is, how much water?
I found a paper written by Gary S. Bender, Ph.D. entitled "Avocado Production in Home Gardens".
At the end of the paper, he published a table showing avocado irrigation needs by month and diameter of the tree canopy for San Diego County. Those numbers are gallons of water per day! He doesn't recommend watering daily, so during the summer months this means watering 250-400 gallons once per week (or thereabouts).
We're not terribly far from San Diego -- and our climate is similar -- so I think the calculations would be similar. That said, this seems like a LOT of water for an established tree. I've always known avocado trees were thirsty, but not this thirsty.
I'm not sure if these numbers assume a specific soil type but I wonder if clay soil that doesn't drain as well reduces the watering needs?