Look at the original soil ball - plant is either too wet or too dry.

I am a newbie to gardening so I am not exactly sure what you mean. The plant has been getting water through a drip system for 3 times a week at 10 minute intervals. We had a pretty hot summer (100+ degrees), but have cooled down to the 80s. I am wondering if that caused the soiled to become too moist. In the last week we have reverted to a 10 minute a week schedule. I just put my finger in the soil closest to the tree, it doesn't seem to be very dry but it isn't very moist either.

Poke around in the soil the plant came in and look at it, see if it is muddy or dusty.

how did you determine that 10 mins by 3x per week is sufficient to water the root ball you planted ... if you dont check the soil to find out?? ..most likely it is not enough .. but im not there.. so i cant find out ... use a hand trowel to dig some small hole above [if you can] and beside the original root mass planted.. 3 to 6 inches down .. and find out ....

it is imperative that you always note where you are ...

what is your native soil ... did you amend the planting hole .. see link ..

i might give it until next spring flush to see how it overwintered ... but on the other hand.. looking at it all winter.. might just keep me irritated all winter ... the decision is up to you.. on that dynamic .... besides... you will really find out.. how moist it is.. down 12 inches or so.. when you yank it out ...

ken

https://sites.google.com/site/tnarboretum/Home/planting-a-tree-or-shrub

Main thing may be to dig into original soil ball - rather than the soil above it and to the side - as it may turn out to have a quite different moisture content from the surrounding soil. With this being the "root" of the problem.

once a soil-less mix is removed from a container it goes from holding adequate to

excessive water in the container, abruptly, to holding very little water. Water is pulled away from
the container growth medium and into the surrounding soil very rapidly due to the greater
capillary attraction of the small pores in the soil compared to the large pores in the container
growth medium. A thorough soaking / watering by hand to assure contact between the soil-less
mix and the surrounding soil is a must

For more click on Establish of Container Grown Plants in the right hand column.

https://rootmaker.com/knowledge-center

Unfortunately with that amount of browning specimen has probably been lost already.

They are not getting nearly enough water with that drip program!! Even the largest drip emitters only release 2G per hour. For a 10 minute emission period, that's only about 1/3 of a gallon and they should be getting somewhere around 2-3G per plant per irrigation period (2-3 times a week) and more if larger trees, very sandy soil or very hot and dry conditions.