There does exist sub-surface irrigation setups. They aren't popular, but obviously would deliver water closer to the roots of tree. Note: I haven't ever seen a

There does exist sub-surface irrigation setups. They aren't popular, but obviously would deliver water closer to the roots of tree. Note: I haven't ever seen a tree farm with sub-surface irrigation, only annual fruits/vegetables/crops https://extension.colostate.edu/topic-areas/agriculture/subsurface-drip-irrigation-sdi-4-716/ https://extension.colostate.edu/topic-areas/agriculture/subs...