Watering a newly planted tree

Sorry - probably a silly question, but how often should you water a newly planted tree with no leaves? I do know they require to be watered copiously in the first two years of planting, but with no leaves on the tree (yet) there isn't likely to be much transpiration going on, so concerned if I water (too much) it will cause problems (ie water logged and then rotting roots).
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The tree is a Gingko Biloba.
Thanks for your idea Josusa47. Might do that, although it will be a retrospective fit as it's already in the ground.